当用户在ipad中触摸屏幕的任何部分时如何调用任何方法

Question

我有一个ipad应用程序我想要如果用户触摸屏幕的任何部分，那么它应该显示警报。我已经研究了触摸开始和结束点等方法，但是如果用户触摸屏幕，如何在触摸时调用方法。

Answer 1

您正在寻找：

UITapGestureRecognizer *singleFingerTap = 
  [[UITapGestureRecognizer alloc] initWithTarget:self 
                                          action:@selector(handleSingleTap:)];
[self.view addGestureRecognizer:singleFingerTap];

//The event handling method
- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer {
  CGPoint location = [recognizer locationInView:[recognizer.view superview]];

  //Do stuff here...
}

Answer 2

在iOS 3.2及更高版本中，您可以使用手势识别器。例如，这是您处理点击事件的方式：

//The setup code (in viewDidLoad in your view controller)
UITapGestureRecognizer *singleFingerTap = 
  [[UITapGestureRecognizer alloc] initWithTarget:self 
                                          action:@selector(handleSingleTap:)];
[self.view addGestureRecognizer:singleFingerTap];
[singleFingerTap release];

//The event handling method
- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer {
  CGPoint location = [recognizer locationInView:[recognizer.view superview]];

  //Do stuff here...
}

还有一堆内置手势。查看iOS事件处理和UIGestureRecognizer的文档。 github上可能有帮助的大量示例代码。