ios - 如何全局跟踪 UITouches？

Question

我想设置一个全局 UITouch 处理程序来调试正在通过系统的所有 UITouch 事件以及哪个 View 是目标等。我该如何实现？

Answer 1

创建一个 UIApplication 的子类来覆盖 sendEvent: 方法:

@interface MyApplication : UIApplication
@end

@implementation MyApplication

- (void)sendEvent:(UIEvent *)event {
    if (event.type == UIEventTypeTouches) {
        NSLog(@"Touch event: %@", event);
    }
    [super sendEvent:event];
}

@end

将这个子类的名称传递给main.m中的UIApplicationMain:

#import <UIKit/UIKit.h>
#import "AppDelegate.h"
#import "MyApplication.h"

int main(int argc, char *argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv,
            NSStringFromClass([MyApplication class]),
            NSStringFromClass([AppDelegate class]));
    }
}