iphone - 同时按两个按钮

Question

我的应用有 2 个按钮，靠近。

我想同时触摸这两个按钮，只用一根手指。

有没有办法检查触摸是否同时在这两个按钮上？

Answer 1

你可以(但真的不应该)像 Abizern 说的那样用一根手指触摸 2 个按钮，但是你也可以为一个按钮触摸调用 2 个方法。例如:

-(void)viewDidLoad {
    self.myButton = /*initialize the button*/;
    [self.myButton addTarget:self action:@selector(callTwoMethods) forControlEvents:UIControlEventTouchUpInside];
}

-(void)callTwoMethods {
    [self methodOne];
    [self methodTwo];
}

但是，对于您要尝试执行的操作而言，这并不总是正确的行为，因此从 iOS 3 开始，我们可以使用 UITouch 和事件机制进行一些调整来解决很多问题:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    if ([touches count] == 2) {
        //we are aware of two touches, so get them both
        UITouch *firstTouch = [[allTouches allObjects] objectAtIndex:0];
        UITouch *secondTouch = [[allTouches allObjects] objectAtIndex:1];

        CGPoint firstPoint = [firstTouch locationInView:self.view];
        CGPoint secondPoint = [secondTouch locationInView:self.view];

        if ([self.firstButton pointInside:firstPoint withEvent:event] && [self.secondButton secondPoint withEvent:event] || /*the opposite test for firstButton getting the first and secondButton getting the second touch*/) {
            //Do stuff
        }
    }