iOS拦截控件事件，处理后继续执行原来的消息传递流程

最新推荐文章于 2024-05-12 18:09:52 发布

StudyRecord

最新推荐文章于 2024-05-12 18:09:52 发布

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分类专栏： iPhone开发有关

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本文介绍了如何在iOS中拦截UIEvent事件，并在处理后继续执行原有的消息传递流程。通过Objective-C runtime方法交换，实现对UIWindow的sendEvent:方法的拦截，从而在事件触发时进行自定义操作。

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#import <objc/objc.h>

#import <objc/runtime.h>

- (void)sendEventHooked:(UIEvent *)event {

//在这里做你想做的事情吧

NSLog(@"截获事件:%@", [eventdescription]);

//执行原来的消息传递流程

[selfperformSelector:@selector(sendEventOriginal:)withObject:event];

}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

Method sendEvent =class_getInstanceMethod([UIWindowclass],@selector(sendEvent:));

Method sendEventMySelf =class_getInstanceMethod([selfclass], @selector(sendEventHooked:));

IMP sendEventImp =method_getImplementation(sendEvent);

class_addMethod([UIWindowclass],@selector(sendEventOriginal:), sendEventImp,method_getTypeEncoding(sendEvent));

IMP sendEventMySelfImp =method_getImplementation(sendEventMySelf);

class_replaceMethod([UIWindowclass],@selector(sendEvent:), sendEventMySelfImp,method_getTypeEncoding(sendEvent));

self.window = [[[UIWindowalloc]initWithFrame:[[UIScreenmainScreen]bounds]]autorelease];

// Override point for customization after application launch.

if ([[UIDevicecurrentDevice]userInterfaceIdiom] ==UIUserInterfaceIdiomPhone) {

self.viewController = [[[ViewControlleralloc]initWithNibName:@"ViewController_iPhone"bundle:nil]autorelease];

}else {

self.viewController = [[[ViewControlleralloc]initWithNibName:@"ViewController_iPad"bundle:nil]autorelease];

}

self.window.rootViewController =self.viewController;

[self.windowmakeKeyAndVisible];

return YES;

}

然后可以在其它地方创建按钮，就可以截获到按钮触摸事件！