UIButton点击动画 ---pop动画

@interface FlatButton : UIButton

重写构造方法

+ (instancetype)button
{
    return [self buttonWithType:UIButtonTypeCustom];
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setup];
    }
    return self;
}

-(id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self setup];
    }
    return self;
}

添加响应

//添加按下和进入的响应
    [self addTarget:self action:@selector(scaleToSmall)
   forControlEvents:UIControlEventTouchDown | UIControlEventTouchDragEnter];
    //添加按下的响应
    [self addTarget:self action:@selector(scaleAnimation)
   forControlEvents:UIControlEventTouchUpInside];
    //添加划出button范围的响应
    [self addTarget:self action:@selector(scaleToDefault)
   forControlEvents:UIControlEventTouchDragExit];

UIControlEventTouchDragExit  手指离开边界回调

An event where a finger is dragged from within a control to outside its bounds.

但是实际却是离开button边界70左右才回调

接下来使用到pop动画

- (void)scaleToSmall
{
    NSLog(@"scaletoSmall");
    POPBasicAnimation *scaleAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
    scaleAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(0.95f, 0.95f)];
    [self.layer pop_addAnimation:scaleAnimation forKey:@"layerScaleSmallAnimation"];
}

- (void)scaleAnimation
{
    NSLog(@"scaleAnimation");
    POPSpringAnimation *scaleAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
    scaleAnimation.velocity = [NSValue valueWithCGSize:CGSizeMake(6.f, 6.f)];
    scaleAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(1.f, 1.f)];
    scaleAnimation.springBounciness = 22.0f;
    [self.layer pop_addAnimation:scaleAnimation forKey:@"layerScaleSpringAnimation"];
}

- (void)scaleToDefault
{
    NSLog(@"scaletoDefault");
    POPBasicAnimation *scaleAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
    scaleAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(1.f, 1.f)];
    [self.layer pop_addAnimation:scaleAnimation forKey:@"layerScaleDefaultAnimation"];
}

设置一下标题偏移

- (UIEdgeInsets)titleEdgeInsets
{
    //top, left, bottom, right
    return UIEdgeInsetsMake(4.f,
                            28.f,
                            4.f,
                            28.f);
}

控件的内置大小 --- 由控件本身的内容所决定的

- (CGSize)intrinsicContentSize
{
    CGSize s = [super intrinsicContentSize];

    return CGSizeMake(s.width + self.titleEdgeInsets.left + self.titleEdgeInsets.right,
                      s.height + self.titleEdgeInsets.top + self.titleEdgeInsets.bottom);
    
}