Core IOS Sample 2-2 Button Zoom动画

button on/off

为 button 添加了两个事件

[button addTarget:button action:@selector(zoomButton:) forControlEvents: UIControlEventTouchDown | UIControlEventTouchDragInside | UIControlEventTouchDragEnter];
[button addTarget:button action:@selector(relaxButton:) forControlEvents: UIControlEventTouchDragExit | UIControlEventTouchCancel | UIControlEventTouchDragOutside];

对应 selector 为：

- (void)zoomButton:(UIButton *)aButton
{
    [UIView animateWithDuration:0.2f
                     animations:^{
                         self.transform = CGAffineTransformMakeScale(1.1f, 1.1f);
                     }];
}

- (void)relaxButton:(UIButton *)aButton
{
    [UIView animateWithDuration:0.2f
                     animations:^{
                         self.transform = CGAffineTransformIdentity;
                     }];
}