cocoa

问题 The gods have parachuted many habits into my isolated jungle village, such as: - (void) dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; [super dealloc]; } Their ways are strange to me, yet I still seek to understand them. Why bother cleaning loose ends up if the instance is going away? Will the reference/retain count to that instance not be decremented? Will it clutter some sort of Notification Hash Table lurking out there that holds a list of all the listeners? 回答1:

问题 I have a empty created project in Xcode. When I press run button, it displays a window. How can I change it's appearance like transparency of window etc. I've searched a lot but everyone uses a window variable to change like here but how can I create NSWindow instance? I'm new to mac app development. So can anyone write a detailed answer? Thank you! 回答1: You can get an instance of your application window as follow: guard let window = NSApplication.shared().windows.first else { return } window

问题 I have a empty created project in Xcode. When I press run button, it displays a window. How can I change it's appearance like transparency of window etc. I've searched a lot but everyone uses a window variable to change like here but how can I create NSWindow instance? I'm new to mac app development. So can anyone write a detailed answer? Thank you! 回答1: You can get an instance of your application window as follow: guard let window = NSApplication.shared().windows.first else { return } window

问题 I am using the following code in my Cocoa project to call a script I made. The script is in the same folder as the project and even shows up under the "Resources" folder in Xcode. The proper path is found, but it still says that the path is not accessible. Help please. NSBundle *mainBundle=[NSBundle mainBundle]; NSString *path=[mainBundle pathForResource:@"script" ofType:@"sh"]; NSTask *task = [[NSTask alloc] init]; [task setLaunchPath: path]; NSLog (path); NSPipe *pipe = [NSPipe pipe]; [task

问题 I'm a little confused. The Apple Documentation states this: Note: For performance reasons, Cocoa does not enforce clipping among sibling views or guarantee correct invalidation and drawing behavior when sibling views overlap. If you want a view to be drawn in front of another view, you should make the front view a subview (or descendant) of the rear view. So according to this, sibling views should not overlap or else the behavior is undefined. In the Cocoa Slides demo app, however, layer

问题 An Xcode beginner's question: It is my first experience with Xcode 4.6.3. I am trying to write a very simple console program, that searches for paired BT devices and prints them to an NSLog. It builds with the following error: Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_IOBluetoothDevice", referenced from: objc-class-ref in main.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) I searched like crazy.

问题 An Xcode beginner's question: It is my first experience with Xcode 4.6.3. I am trying to write a very simple console program, that searches for paired BT devices and prints them to an NSLog. It builds with the following error: Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_IOBluetoothDevice", referenced from: objc-class-ref in main.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) I searched like crazy.

问题 I have a grouped table view with multiple cells in each group.What I want is, when user selects any perticular cell; I want to show child element of the particular selected cell. For example: If user selects "A" then I should show "A1","A2","A3"... Or "B" then it should show "B1","B2","B3"...** In another viewcontroller's table object.** There is no restriction on hard-coding the child values. My segue is connected from the table view to another viewcontroller. 回答1: In your second view

问题 I have a grouped table view with multiple cells in each group.What I want is, when user selects any perticular cell; I want to show child element of the particular selected cell. For example: If user selects "A" then I should show "A1","A2","A3"... Or "B" then it should show "B1","B2","B3"...** In another viewcontroller's table object.** There is no restriction on hard-coding the child values. My segue is connected from the table view to another viewcontroller. 回答1: In your second view

问题 I have a grouped table view with multiple cells in each group.What I want is, when user selects any perticular cell; I want to show child element of the particular selected cell. For example: If user selects "A" then I should show "A1","A2","A3"... Or "B" then it should show "B1","B2","B3"...** In another viewcontroller's table object.** There is no restriction on hard-coding the child values. My segue is connected from the table view to another viewcontroller. 回答1: In your second view