diff --git a/src/QtCore/QtChildEvent.h b/src/QtCore/QtChildEvent.h
index 8ccabff..8a53f13 100644
--- a/src/QtCore/QtChildEvent.h
+++ b/src/QtCore/QtChildEvent.h
@@ -31,10 +31,11 @@
 @property (readonly, nonatomic, getter=isPolished) bool polished;
 @property (readonly, nonatomic, getter=isRemoved) bool removed;
 
-- initWithQEvent: (QEvent *)event OF_UNAVAILABLE;
-- initWithQChildEvent: (QChildEvent *)qChildEvent OF_DESIGNATED_INITIALIZER;
-- initWithType: (QChildEvent::Type)type
-	 child: (QtObject *)child;
+- (instancetype)initWithQEvent: (QEvent *)event OF_UNAVAILABLE;
+- (instancetype)initWithQChildEvent:
+    (QChildEvent *)qChildEvent OF_DESIGNATED_INITIALIZER;
+- (instancetype)initWithType: (QChildEvent::Type)type
+		       child: (QtObject *)child;
 @end
 
 namespace ObjQt {
@@ -52,7 +53,7 @@ toOF(QChildEvent *qChildEvent)
 static OF_INLINE QChildEvent *
 toQt(QtChildEvent *childEvent)
 {
-	return [childEvent qChildEvent];
+	return childEvent.qChildEvent;
 }
 
 }
diff --git a/src/QtCore/QtChildEvent.mm b/src/QtCore/QtChildEvent.mm
index ab1d7cd..d16d416 100644
--- a/src/QtCore/QtChildEvent.mm
+++ b/src/QtCore/QtChildEvent.mm
@@ -27,18 +27,18 @@ using ObjQt::toOF;
 using ObjQt::toQt;
 
 @implementation QtChildEvent
-- initWithQEvent: (QEvent *)event
+- (instancetype)initWithQEvent: (QEvent *)event
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQChildEvent: (QChildEvent *)event
+- (instancetype)initWithQChildEvent: (QChildEvent *)event
 {
 	return [super initWithQEvent: event];
 }
 
-- initWithType: (QChildEvent::Type)type
-	 child: (QtObject *)child
+- (instancetype)initWithType: (QChildEvent::Type)type
+		       child: (QtObject *)child
 {
 	try {
 		self = [self initWithQChildEvent:
diff --git a/src/QtCore/QtCoreApplication.h b/src/QtCore/QtCoreApplication.h
index 81b6666..c6440bd 100644
--- a/src/QtCore/QtCoreApplication.h
+++ b/src/QtCore/QtCoreApplication.h
@@ -30,8 +30,8 @@
 @property (nonatomic, copy) OFString *organizationDomain, *organizationName;
 @property (nonatomic, getter=isQuitLockEnabled) bool quitLockEnabled;
 
-- initWithQObject: (QObject *)qObject OF_UNAVAILABLE;
-- initWithQCoreApplication: (QCoreApplication *)qCoreApplication
+- (instancetype)initWithQObject: (QObject *)qObject OF_UNAVAILABLE;
+- (instancetype)initWithQCoreApplication: (QCoreApplication *)qCoreApplication
     OF_DESIGNATED_INITIALIZER;
 - (void)installNativeEventFilter: (QAbstractNativeEventFilter *)filterObject;
 - (void)quit;
@@ -55,7 +55,7 @@ toOF(QCoreApplication *qCoreApplication)
 static OF_INLINE QCoreApplication *
 toQt(QtCoreApplication *coreApplication)
 {
-	return [coreApplication qCoreApplication];
+	return coreApplication.qCoreApplication;
 }
 
 }
diff --git a/src/QtCore/QtCoreApplication.mm b/src/QtCore/QtCoreApplication.mm
index ab9aa87..1fe2185 100644
--- a/src/QtCore/QtCoreApplication.mm
+++ b/src/QtCore/QtCoreApplication.mm
@@ -28,12 +28,12 @@ using ObjQt::toOF;
 using ObjQt::toQt;
 
 @implementation QtCoreApplication
-- initWithQObject: (QObject *)qObject
+- (instancetype)initWithQObject: (QObject *)qObject
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQCoreApplication: (QCoreApplication *)qCoreApplication
+- (instancetype)initWithQCoreApplication: (QCoreApplication *)qCoreApplication
 {
 	return [super initWithQObject: qCoreApplication];
 }
diff --git a/src/QtCore/QtEvent.h b/src/QtCore/QtEvent.h
index 165a7de..2a17370 100644
--- a/src/QtCore/QtEvent.h
+++ b/src/QtCore/QtEvent.h
@@ -38,8 +38,8 @@
 @property (readonly, nonatomic) QEvent::Type type;
 
 + (int)registerEventType: (int)hint;
-- init OF_UNAVAILABLE;
-- initWithQEvent: (QEvent *)qEvent OF_DESIGNATED_INITIALIZER;
+- (instancetype)init OF_UNAVAILABLE;
+- (instancetype)initWithQEvent: (QEvent *)qEvent OF_DESIGNATED_INITIALIZER;
 - (void)accept;
 - (void)ignore;
 @end
@@ -58,7 +58,7 @@ toOF(QEvent *qEvent)
 static OF_INLINE QEvent *
 toQt(QtEvent *event)
 {
-	return [event qEvent];
+	return event.qEvent;
 }
 
 }
diff --git a/src/QtCore/QtEvent.mm b/src/QtCore/QtEvent.mm
index 2179f0c..35d3deb 100644
--- a/src/QtCore/QtEvent.mm
+++ b/src/QtCore/QtEvent.mm
@@ -30,12 +30,12 @@
 	return QEvent::registerEventType(hint);
 }
 
-- init
+- (instancetype)init
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQEvent: (QEvent *)qEvent
+- (instancetype)initWithQEvent: (QEvent *)qEvent
 {
 	self = [super init];
 
diff --git a/src/QtCore/QtObject.h b/src/QtCore/QtObject.h
index 06092a9..6500311 100644
--- a/src/QtCore/QtObject.h
+++ b/src/QtCore/QtObject.h
@@ -44,8 +44,8 @@
     OFArray OF_GENERIC(OFData *) *dynamicPropertyNames;
 @property (readonly, nonatomic) QtThread *thread;
 
-- init OF_UNAVAILABLE;
-- initWithQObject: (QObject *)qObject OF_DESIGNATED_INITIALIZER;
+- (instancetype)init OF_UNAVAILABLE;
+- (instancetype)initWithQObject: (QObject *)qObject OF_DESIGNATED_INITIALIZER;
 - (bool)setBlockSignals: (bool)block;
 - (QMetaObject::Connection)connectSignal: (OFString *)signal
 				  sender: (QtObject *)sender
@@ -97,7 +97,7 @@ toOF(QObject *qObject)
 static OF_INLINE QObject *
 toQt(QtObject *object)
 {
-	return [object qObject];
+	return object.qObject;
 }
 
 }
diff --git a/src/QtCore/QtObject.mm b/src/QtCore/QtObject.mm
index cb0d369..3184a31 100644
--- a/src/QtCore/QtObject.mm
+++ b/src/QtCore/QtObject.mm
@@ -34,12 +34,12 @@ using ObjQt::toQt;
 @implementation QtObject
 @synthesize qObject = _qObject;
 
-- init
+- (instancetype)init
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQObject: (QObject *)qObject
+- (instancetype)initWithQObject: (QObject *)qObject
 {
 	self = [super init];
 
@@ -106,21 +106,21 @@ using ObjQt::toQt;
 				    type: (Qt::ConnectionType)type
 {
 	return _qObject->connect(toQt(sender),
-	    [signal UTF8String], [method UTF8String], type);
+	    signal.UTF8String, method.UTF8String, type);
 }
 
 - (bool)disconnectSignal: (OFString *)signal
 		receiver: (QtObject *)receiver
 		  method: (OFString *)method
 {
-	return _qObject->disconnect([signal UTF8String], toQt(receiver),
-	    [method UTF8String]);
+	return _qObject->disconnect(signal.UTF8String, toQt(receiver),
+	    method.UTF8String);
 }
 
 - (bool)disconnectAllSignalsForReceiver: (QtObject *)receiver
 				 method: (OFString *)method
 {
-	return _qObject->disconnect(toQt(receiver), [method UTF8String]);
+	return _qObject->disconnect(toQt(receiver), method.UTF8String);
 }
 
 - (void)dumpObjectInfo
@@ -164,7 +164,7 @@ using ObjQt::toQt;
 
 - (bool)inheritsClassWithName: (OFString *)className
 {
-	return _qObject->inherits([className UTF8String]);
+	return _qObject->inherits(className.UTF8String);
 }
 
 - (void)installEventFilter: (QtObject *)filterObj
@@ -209,7 +209,7 @@ using ObjQt::toQt;
 
 - (QVariant)propertyForName: (OFString *)name
 {
-	return _qObject->property([name UTF8String]);
+	return _qObject->property(name.UTF8String);
 }
 
 - (void)removeEventFilter: (QtObject *)obj
@@ -220,7 +220,7 @@ using ObjQt::toQt;
 - (bool)setProperty: (QVariant &)value
 	    forName: (OFString *)name
 {
-	return _qObject->setProperty([name UTF8String], value);
+	return _qObject->setProperty(name.UTF8String, value);
 }
 
 - (bool)signalsBlocked
diff --git a/src/QtCore/QtThread.h b/src/QtCore/QtThread.h
index 4343b12..3516d8a 100644
--- a/src/QtCore/QtThread.h
+++ b/src/QtCore/QtThread.h
@@ -35,8 +35,8 @@
 @property (nonatomic) QThread::Priority priority;
 @property (nonatomic) unsigned int stackSize;
 
-- initWithQObject: (QObject *)qObject OF_UNAVAILABLE;
-- initWithQThread: (QThread *)qThread OF_DESIGNATED_INITIALIZER;
+- (instancetype)initWithQObject: (QObject *)qObject OF_UNAVAILABLE;
+- (instancetype)initWithQThread: (QThread *)qThread OF_DESIGNATED_INITIALIZER;
 - (void)exitWithReturnCode: (int)returnCode;
 - (void)requestInterruption;
 - (bool)waitForMilliseconds: (unsigned long)time;
@@ -59,7 +59,7 @@ toOF(QThread *qThread)
 static OF_INLINE QThread *
 toQt(QtThread *thread)
 {
-	return [thread qThread];
+	return thread.qThread;
 }
 
 }
diff --git a/src/QtCore/QtThread.mm b/src/QtCore/QtThread.mm
index e0ebc6a..f17919a 100644
--- a/src/QtCore/QtThread.mm
+++ b/src/QtCore/QtThread.mm
@@ -25,12 +25,12 @@
 using ObjQt::toQt;
 
 @implementation QtThread: QtObject
-- initWithQObject: (QObject *)qObject
+- (instancetype)initWithQObject: (QObject *)qObject
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQThread: (QThread *)qThread
+- (instancetype)initWithQThread: (QThread *)qThread
 {
 	return [super initWithQObject: qThread];
 }
diff --git a/src/QtGui/QtGUIApplication.h b/src/QtGui/QtGUIApplication.h
index 848e6f1..7e6c35c 100644
--- a/src/QtGui/QtGUIApplication.h
+++ b/src/QtGui/QtGUIApplication.h
@@ -38,8 +38,9 @@
 @property (readonly, nonatomic) OFString *sessionID;
 @property (readonly, nonatomic) OFString *sessionKey;
 
-- initWithQCoreApplication: (QCoreApplication *)qCoreApplication OF_UNAVAILABLE;
-- initWithQGuiApplication: (QGuiApplication *)qGuiApplication
+- (instancetype)initWithQCoreApplication: (QCoreApplication *)qCoreApplication
+    OF_UNAVAILABLE;
+- (instancetype)initWithQGuiApplication: (QGuiApplication *)qGuiApplication
     OF_DESIGNATED_INITIALIZER;
 - (double)devicePixelRatio;
 - (bool)isSavingSession;
@@ -61,7 +62,7 @@ toOF(QGuiApplication *qGuiApplication)
 static OF_INLINE QGuiApplication *
 toQt(QtGUIApplication *GUIApplication)
 {
-	return [GUIApplication qGuiApplication];
+	return GUIApplication.qGuiApplication;
 }
 
 }
diff --git a/src/QtGui/QtGUIApplication.mm b/src/QtGui/QtGUIApplication.mm
index 67ac7be..f2fdf11 100644
--- a/src/QtGui/QtGUIApplication.mm
+++ b/src/QtGui/QtGUIApplication.mm
@@ -29,12 +29,12 @@ using ObjQt::toOF;
 using ObjQt::toQt;
 
 @implementation QtGUIApplication
-- initWithQCoreApplication: (QCoreApplication *)qCoreApplication
+- (instancetype)initWithQCoreApplication: (QCoreApplication *)qCoreApplication
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQGuiApplication: (QGuiApplication *)qGuiApplication
+- (instancetype)initWithQGuiApplication: (QGuiApplication *)qGuiApplication
 {
 	return [super initWithQCoreApplication: qGuiApplication];
 }
diff --git a/src/QtGui/QtPaintDevice.h b/src/QtGui/QtPaintDevice.h
index a5df788..99de6d5 100644
--- a/src/QtGui/QtPaintDevice.h
+++ b/src/QtGui/QtPaintDevice.h
@@ -53,7 +53,7 @@ namespace ObjQt {
 static OF_INLINE QPaintDevice *
 toQt(id <QtPaintDevice> paintDevice)
 {
-	return [paintDevice qPaintDevice];
+	return paintDevice.qPaintDevice;
 }
 
 }
diff --git a/src/QtGui/QtPaintDevice.mm b/src/QtGui/QtPaintDevice.mm
index 0bf4a16..5787c58 100644
--- a/src/QtGui/QtPaintDevice.mm
+++ b/src/QtGui/QtPaintDevice.mm
@@ -31,7 +31,7 @@ using ObjQt::toQt;
 
 - (QPaintDevice *)qPaintDevice
 {
-	return dynamic_cast<QPaintDevice *>([self qObject]);
+	return dynamic_cast<QPaintDevice *>(self.qObject);
 }
 
 - (int)colorCount
diff --git a/src/QtWidgets/QtAbstractButton.h b/src/QtWidgets/QtAbstractButton.h
index 226ce28..f601253 100644
--- a/src/QtWidgets/QtAbstractButton.h
+++ b/src/QtWidgets/QtAbstractButton.h
@@ -39,8 +39,8 @@
 @property (nonatomic, copy) OFString *text;
 @property (readonly, nonatomic) QButtonGroup *group;
 
-- initWithQWidget: (QWidget *)qWidget OF_UNAVAILABLE;
-- initWithQAbstractButton: (QAbstractButton *)qAbstractButton
+- (instancetype)initWithQWidget: (QWidget *)qWidget OF_UNAVAILABLE;
+- (instancetype)initWithQAbstractButton: (QAbstractButton *)qAbstractButton
     OF_DESIGNATED_INITIALIZER;
 @end
 
@@ -59,7 +59,7 @@ toOF(QAbstractButton *qAbstractButton)
 static OF_INLINE QAbstractButton *
 toQt(QtAbstractButton *abstractButton)
 {
-	return [abstractButton qAbstractButton];
+	return abstractButton.qAbstractButton;
 }
 
 }
diff --git a/src/QtWidgets/QtAbstractButton.mm b/src/QtWidgets/QtAbstractButton.mm
index 0c634a7..8208d95 100644
--- a/src/QtWidgets/QtAbstractButton.mm
+++ b/src/QtWidgets/QtAbstractButton.mm
@@ -29,12 +29,12 @@ using ObjQt::toOF;
 using ObjQt::toQt;
 
 @implementation QtAbstractButton
-- initWithQWidget: (QWidget *)qWidget
+- (instancetype)initWithQWidget: (QWidget *)qWidget
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQAbstractButton: (QAbstractButton *)qAbstractButton
+- (instancetype)initWithQAbstractButton: (QAbstractButton *)qAbstractButton
 {
 	return [super initWithQWidget: qAbstractButton];
 }
diff --git a/src/QtWidgets/QtAction.h b/src/QtWidgets/QtAction.h
index 5655b91..23c9b49 100644
--- a/src/QtWidgets/QtAction.h
+++ b/src/QtWidgets/QtAction.h
@@ -47,11 +47,11 @@
 @property (copy, nonatomic) OFString *whatsThis;
 @property (readonly, nonatomic)
     OFArray OF_GENERIC(QtWidget *) *associatedWidgets;
-    @property (nonatomic, setter=setSeparator:) bool isSeparator;
+@property (nonatomic, setter=setSeparator:) bool isSeparator;
 @property (readonly, nonatomic) QtWidget *parentWidget;
 
-- initWithQObject: (QObject *)qObject OF_UNAVAILABLE;
-- initWithQAction: (QAction *)qAction OF_DESIGNATED_INITIALIZER;
+- (instancetype)initWithQObject: (QObject *)qObject OF_UNAVAILABLE;
+- (instancetype)initWithQAction: (QAction *)qAction OF_DESIGNATED_INITIALIZER;
 - (QActionGroup *)actionGroup;
 - (void)activate: (QAction::ActionEvent)event;
 - (QList<QGraphicsWidget *>)associatedGraphicsWidgets;
@@ -79,7 +79,7 @@ toOF(QAction *qAction)
 static OF_INLINE QAction *
 toQt(QtAction *action)
 {
-	return [action qAction];
+	return action.qAction;
 }
 
 }
diff --git a/src/QtWidgets/QtAction.mm b/src/QtWidgets/QtAction.mm
index 3354a16..5faa480 100644
--- a/src/QtWidgets/QtAction.mm
+++ b/src/QtWidgets/QtAction.mm
@@ -28,12 +28,12 @@ using ObjQt::toOF;
 using ObjQt::toQt;
 
 @implementation QtAction
-- initWithQObject: (QObject *)qObject
+- (instancetype)initWithQObject: (QObject *)qObject
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQAction: (QAction *)qAction
+- (instancetype)initWithQAction: (QAction *)qAction
 {
 	return [super initWithQObject: qAction];
 }
diff --git a/src/QtWidgets/QtApplication.h b/src/QtWidgets/QtApplication.h
index f4beb8a..958c063 100644
--- a/src/QtWidgets/QtApplication.h
+++ b/src/QtWidgets/QtApplication.h
@@ -36,8 +36,10 @@
 @property (nonatomic, copy) OFString *styleSheet;
 @property (nonatomic) int wheelScrollLines;
 
-- initWithQGuiApplication: (QGuiApplication *)qGuiApplication OF_UNAVAILABLE;
-- initWithQApplication: (QApplication *)qApplication OF_DESIGNATED_INITIALIZER;
+- (instancetype)initWithQGuiApplication: (QGuiApplication *)qGuiApplication
+    OF_UNAVAILABLE;
+- (instancetype)initWithQApplication: (QApplication *)qApplication
+    OF_DESIGNATED_INITIALIZER;
 - (void)aboutQt;
 - (void)closeAllWindows;
 @end
@@ -57,7 +59,7 @@ toOF(QApplication *qApplication)
 static OF_INLINE QApplication *
 toQt(QtApplication *application)
 {
-	return [application qApplication];
+	return application.qApplication;
 }
 
 }
diff --git a/src/QtWidgets/QtApplication.mm b/src/QtWidgets/QtApplication.mm
index fdb8950..c3637df 100644
--- a/src/QtWidgets/QtApplication.mm
+++ b/src/QtWidgets/QtApplication.mm
@@ -29,12 +29,12 @@ using ObjQt::toOF;
 using ObjQt::toQt;
 
 @implementation QtApplication
-- initWithQGuiApplication: (QGuiApplication *)qGuiApplication
+- (instancetype)initWithQGuiApplication: (QGuiApplication *)qGuiApplication
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQApplication: (QApplication *)qApplication
+- (instancetype)initWithQApplication: (QApplication *)qApplication
 {
 	return [super initWithQGuiApplication: qApplication];
 }
diff --git a/src/QtWidgets/QtGraphicsWidget.h b/src/QtWidgets/QtGraphicsWidget.h
index d4aed15..cb0a20b 100644
--- a/src/QtWidgets/QtGraphicsWidget.h
+++ b/src/QtWidgets/QtGraphicsWidget.h
@@ -52,8 +52,8 @@
 @property (readonly, nonatomic) of_rectangle_t windowFrameGeometry;
 @property (readonly, nonatomic) of_rectangle_t windowFrameRect;
 
-- initWithQObject: (QObject *)qObject OF_UNAVAILABLE;
-- initWithQGraphicsWidget: (QGraphicsWidget *)qGraphicsWidget
+- (instancetype)initWithQObject: (QObject *)qObject OF_UNAVAILABLE;
+- (instancetype)initWithQGraphicsWidget: (QGraphicsWidget *)qGraphicsWidget
     OF_DESIGNATED_INITIALIZER;
 - (void)addAction: (QtAction *)action;
 - (void)addActions: (OFArray OF_GENERIC(QtAction *) *)actions;
@@ -107,7 +107,7 @@ toOF(QGraphicsWidget *qGraphicsWidget)
 static OF_INLINE QGraphicsWidget *
 toQt(QtGraphicsWidget *graphicsWidget)
 {
-	return [graphicsWidget qGraphicsWidget];
+	return graphicsWidget.qGraphicsWidget;
 }
 
 }
diff --git a/src/QtWidgets/QtGraphicsWidget.mm b/src/QtWidgets/QtGraphicsWidget.mm
index 312868f..0080045 100644
--- a/src/QtWidgets/QtGraphicsWidget.mm
+++ b/src/QtWidgets/QtGraphicsWidget.mm
@@ -33,19 +33,19 @@ using ObjQt::toQt;
 
 @implementation QtGraphicsWidget
 
-- initWithQObject: (QObject *)qObject
+- (instancetype)initWithQObject: (QObject *)qObject
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQGraphicsWidget: (QGraphicsWidget *)qGraphicsWidget
+- (instancetype)initWithQGraphicsWidget: (QGraphicsWidget *)qGraphicsWidget
 {
 	return [super initWithQObject: qGraphicsWidget];
 }
 
 - (QGraphicsWidget *)qGraphicsWidget
 {
-	return dynamic_cast<QGraphicsWidget *>([self qObject]);
+	return dynamic_cast<QGraphicsWidget *>(self.qObject);
 }
 
 - (bool)autoFillBackground
diff --git a/src/QtWidgets/QtPushButton.h b/src/QtWidgets/QtPushButton.h
index 1a2e29b..12fc529 100644
--- a/src/QtWidgets/QtPushButton.h
+++ b/src/QtWidgets/QtPushButton.h
@@ -33,11 +33,13 @@
 @property (nonatomic, getter=isDefault, setter=setDefault:) bool default_;
 @property (nonatomic, getter=isFlat) bool flat;
 
-- initWithQAbstractButton: (QAbstractButton *)qAbstractButton OF_UNAVAILABLE;
-- initWithQPushButton: (QPushButton *)qPushButton OF_DESIGNATED_INITIALIZER;
-- initWithText: (OFString *)text;
-- initWithIcon: (QIcon)icon
-	  text: (OFString *)text;
+- (instancetype)initWithQAbstractButton: (QAbstractButton *)qAbstractButton
+    OF_UNAVAILABLE;
+- (instancetype)initWithQPushButton: (QPushButton *)qPushButton
+    OF_DESIGNATED_INITIALIZER;
+- (instancetype)initWithText: (OFString *)text;
+- (instancetype)initWithIcon: (QIcon)icon
+			text: (OFString *)text;
 @end
 
 namespace ObjQt {
@@ -55,7 +57,7 @@ toOF(QPushButton *qPushButton)
 static OF_INLINE QPushButton *
 toQt(QtPushButton *pushButton)
 {
-	return [pushButton qPushButton];
+	return pushButton.qPushButton;
 }
 
 }
diff --git a/src/QtWidgets/QtPushButton.mm b/src/QtWidgets/QtPushButton.mm
index b722d3b..c4a8e10 100644
--- a/src/QtWidgets/QtPushButton.mm
+++ b/src/QtWidgets/QtPushButton.mm
@@ -30,17 +30,17 @@ using ObjQt::toOF;
 using ObjQt::toQt;
 
 @implementation QtPushButton
-- initWithQAbstractButton: (QAbstractButton *)qAbstractButton
+- (instancetype)initWithQAbstractButton: (QAbstractButton *)qAbstractButton
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQPushButton: (QPushButton *)qPushButton
+- (instancetype)initWithQPushButton: (QPushButton *)qPushButton
 {
 	return [super initWithQAbstractButton: qPushButton];
 }
 
-- initWithText: (OFString *)text
+- (instancetype)initWithText: (OFString *)text
 {
 	try {
 		self = [self initWithQPushButton:
@@ -56,8 +56,8 @@ using ObjQt::toQt;
 	}
 }
 
-- initWithIcon: (QIcon)icon
-	  text: (OFString *)text
+- (instancetype)initWithIcon: (QIcon)icon
+			text: (OFString *)text
 {
 	try {
 		self = [self initWithQPushButton:
diff --git a/src/QtWidgets/QtWidget.h b/src/QtWidgets/QtWidget.h
index 4ed61cf..1c9c6cd 100644
--- a/src/QtWidgets/QtWidget.h
+++ b/src/QtWidgets/QtWidget.h
@@ -98,8 +98,8 @@
 @property (readonly, nonatomic) QtWidget *window;
 @property (readonly, nonatomic) OFString *windowRole;
 
-- initWithQObject: (QObject *)qObject OF_UNAVAILABLE;
-- initWithQWidget: (QWidget *)qWidget OF_DESIGNATED_INITIALIZER;
+- (instancetype)initWithQObject: (QObject *)qObject OF_UNAVAILABLE;
+- (instancetype)initWithQWidget: (QWidget *)qWidget OF_DESIGNATED_INITIALIZER;
 - (void)activateWindow;
 - (void)addAction: (QtAction *)action;
 - (void)addActions: (OFArray OF_GENERIC(QtAction *) *)actions;
@@ -238,7 +238,7 @@ toOF(QWidget *qWidget)
 static OF_INLINE QWidget *
 toQt(QtWidget *widget)
 {
-	return [widget qWidget];
+	return widget.qWidget;
 }
 
 }
diff --git a/src/QtWidgets/QtWidget.mm b/src/QtWidgets/QtWidget.mm
index 8e3eed8..ee97eb1 100644
--- a/src/QtWidgets/QtWidget.mm
+++ b/src/QtWidgets/QtWidget.mm
@@ -40,12 +40,12 @@ using ObjQt::toQt;
 		[self inheritMethodsFromClass: [QtPaintDevice class]];
 }
 
-- initWithQObject: (QObject *)qObject
+- (instancetype)initWithQObject: (QObject *)qObject
 {
 	OF_INVALID_INIT_METHOD
 }
 
-- initWithQWidget: (QWidget *)qWidget
+- (instancetype)initWithQWidget: (QWidget *)qWidget
 {
 	return [super initWithQObject: qWidget];
 }
diff --git a/src/common/OFColor+QColor.h b/src/common/OFColor+QColor.h
index 88569f3..7012c32 100644
--- a/src/common/OFColor+QColor.h
+++ b/src/common/OFColor+QColor.h
@@ -25,9 +25,10 @@
 #include <QColor>
 
 @interface OFColor (QColor)
+@property (readonly, nonatomic) QColor qColor;
+
 + (instancetype)colorWithQColor: (const QColor &)qColor;
 - (instancetype)initWithQColor: (const QColor &)qColor;
-- (QColor)qColor;
 @end
 
 namespace ObjQt {
@@ -47,7 +48,7 @@ toQt(OFColor *color)
 	if (color == nil)
 		return QColor();
 
-	return [color qColor];
+	return color.qColor;
 }
 
 }
diff --git a/src/common/OFData+QByteArray.h b/src/common/OFData+QByteArray.h
index 9aac02d..311a603 100644
--- a/src/common/OFData+QByteArray.h
+++ b/src/common/OFData+QByteArray.h
@@ -25,9 +25,10 @@
 #include <QByteArray>
 
 @interface OFData (QByteArray)
+@property (readonly, nonatomic) QByteArray qByteArray;
+
 + (instancetype)dataWithQByteArray: (const QByteArray &)qByteArray;
 - (instancetype)initWithQByteArray: (const QByteArray &)qByteArray;
-- (QByteArray)qByteArray;
 @end
 
 namespace ObjQt {
@@ -47,7 +48,7 @@ toQt(OFData *data)
 	if (data == nil)
 		return QByteArray();
 
-	return [data qByteArray];
+	return data.qByteArray;
 }
 
 }
diff --git a/src/common/OFData+QByteArray.mm b/src/common/OFData+QByteArray.mm
index 7363e3b..9b1fe5e 100644
--- a/src/common/OFData+QByteArray.mm
+++ b/src/common/OFData+QByteArray.mm
@@ -36,7 +36,6 @@
 
 - (QByteArray)qByteArray
 {
-	return QByteArray((const char *)[self items],
-	    [self count] * [self itemSize]);
+	return QByteArray((const char *)self.items, self.count * self.itemSize);
 }
 @end
diff --git a/src/common/OFString+QString.h b/src/common/OFString+QString.h
index acfea21..9ebdfc9 100644
--- a/src/common/OFString+QString.h
+++ b/src/common/OFString+QString.h
@@ -25,9 +25,10 @@
 #include <QString>
 
 @interface OFString (QString)
+@property (readonly, nonatomic) QString qString;
+
 + (instancetype)stringWithQString: (const QString &)qString;
 - (instancetype)initWithQString: (const QString &)qString;
-- (QString)qString;
 @end
 
 namespace ObjQt {
@@ -47,7 +48,7 @@ toQt(OFString *string)
 	if (string == nil)
 		return QString();
 
-	return [string qString];
+	return string.qString;
 }
 
 }
diff --git a/src/common/OFString+QString.mm b/src/common/OFString+QString.mm
index d06d216..9e12be7 100644
--- a/src/common/OFString+QString.mm
+++ b/src/common/OFString+QString.mm
@@ -43,7 +43,7 @@
 	    "char16_t and QChar have a different size!");
 
 	void *pool = objc_autoreleasePoolPush();
-	QString ret = QString((QChar *)[self UTF16String]);
+	QString ret = QString((QChar *)self.UTF16String);
 
 	objc_autoreleasePoolPop(pool);