倒计时按钮效果

by 伍雪颖

@implementationCountButton {

UIColor
*normal_bgColor;

UIColor *enabled_bgColor;

NSTimer *timer;

NSInteger startCount;

NSInteger originNum;

UILabel *timeLabel;

}

- (id)initWithFrame:(CGRect)frame
{

self = [super
initWithFrame:frame];

if (self) {

normal_bgColor = [UIColor
redColor];

enabled_bgColor = [UIColor
lightGrayColor];

startCount =
0;

originNum =
0;

[self
setTitleColor:[UIColor
whiteColor]
forState:UIControlStateNormal];

self.titleLabel.font
= [UIFont
systemFontOfSize:17];

self.backgroundColor
=
normal_bgColor;

startCount =
5;

originNum =
5;

[self
addLabel];

[self
addTarget:self
action:@selector(startCountDown)
forControlEvents:UIControlEventTouchUpInside];

}

return
self;

}

- (void)startCountDown {

timer = [NSTimer
scheduledTimerWithTimeInterval:1
target:self
selector:@selector(countDown)
userInfo:nil
repeats:YES];

self.backgroundColor
=
enabled_bgColor;

self.enabled
=
NO;

[self
numAnimation];

}

- (void)countDown {

startCount--;

timeLabel.text
=
@(startCount).stringValue;

if (startCount
<
0) {

if (timer
==
nil) {

return;

}

[timeLabel.layer
removeAllAnimations];

timeLabel.text
=
@(originNum).stringValue;

[timer
invalidate];

timer =
nil;

self.enabled
=
YES;

startCount =
originNum;

self.backgroundColor
=
normal_bgColor;

}

}

- (void)numAnimation {

CAKeyframeAnimation *scale = [CAKeyframeAnimation
animationWithKeyPath:@"transform.scale"];

scale.keyTimes
=
@[@0,@0.5,@1];

scale.values
=
@[@1,@1.5,@2];

scale.duration
=
1;

CAKeyframeAnimation *opacity = [CAKeyframeAnimation
animationWithKeyPath:@"opacity"];

opacity.keyTimes
=
@[@0,@0.5,@1];

opacity.values
=
@[@1,@0.5,@0];

opacity.duration
=
1;

CAAnimationGroup *animGroup = [CAAnimationGroup
animation];

animGroup.animations
=
@[scale, opacity];

animGroup.duration
=
1;

animGroup.repeatCount
=
HUGE;

animGroup.removedOnCompletion
=
false;

animGroup.beginTime
=
CACurrentMediaTime();

[timeLabel.layer
addAnimation:animGroup
forKey:@"animatjion"];

[self.layer
addSublayer:timeLabel.layer];

}

- (void)addLabel {

timeLabel = [[UILabel
alloc]
init];

timeLabel.frame
=
CGRectMake(0,
0,
CGRectGetWidth(self.frame),
CGRectGetHeight(self.frame));

timeLabel.backgroundColor
= [UIColor
clearColor];

timeLabel.font
= [UIFont
systemFontOfSize:17];

timeLabel.textAlignment
=
NSTextAlignmentCenter;

timeLabel.text
=
@(originNum).stringValue;

[self
addSubview:timeLabel];

}

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