如何创建GUI并以编程方式响应Cocoa事件？

本文介绍了如何创建GUI并以编程方式响应Cocoa事件？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我发现如何以编程方式在Cocoa中创建一个窗口，但无法弄清楚如何对事件做出反应。

I found out how to create a window in Cocoa programmatically but can't figure out how to react to events. The window is not reacting to a Quit request or button click.

我尝试添加以下控制器，并使用setDelegate / setTarget没有运气：

I tried adding the following controller and used setDelegate/setTarget without luck:

@interface AppController : NSObject { } - (IBAction)doSomething:(id)sender; @end @implementation AppController - (IBAction)doSomething:(id)sender; { printf("Button clicked!\n"); } @end int main(int argc, char **args){ NSRect frame = NSMakeRect(0, 0, 200, 200); AppController *controller = [[AppController alloc] init]; > [[NSApplication sharedApplication] setDelegate:controller]; NSWindow* window = [[NSWindow alloc] initWithContentRect:frame styleMask:NSBorderlessWindowMask|NSClosableWindowMask|NSMiniaturizableWindowMask|NSResizableWindowMask backing:NSBackingStoreBuffered defer:NO]; [window setBackgroundColor:[NSColor blueColor]]; NSButton *button = [ [ NSButton alloc ] initWithFrame: NSMakeRect( 30.0, 20.0, 80.0, 50.0 ) ]; [ button setBezelStyle:NSRoundedBezelStyle]; [ button setTitle: @"Click" ]; > [ button setAction:@selector(doSomething:)]; > [ button setTarget:controller]; [ [ window contentView ] addSubview: button ]; [window makeKeyAndOrderFront:NSApp]; [[NSRunLoop currentRunLoop] run]; return 0; }

推荐答案

NSApplication run]而不是 - [[NSRunLoop currentRunLoop] run]。如果你看看方法的基本结构，原因应该很清楚：

You need to invoke -[NSApplication run] instead of -[[NSRunLoop currentRunLoop] run]. The reason should be clear if you look at the basic structure of the method:

- (void)run { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; [self finishLaunching]; shouldKeepRunning = YES; do { [pool release]; pool = [[NSAutoreleasePool alloc] init]; NSEvent *event = [self nextEventMatchingMask:NSAnyEventMask untilDate:[NSDate distantFuture] inMode:NSDefaultRunLoopMode dequeue:YES]; [self sendEvent:event]; [self updateWindows]; } while (shouldKeepRunning); [pool release]; }

NSApplication封装了很多关于如何获取事件，如何更新窗口。

NSApplication encapsulates a lot about how to get an event, how to dispatch them and how to update windows.