仿解锁UILabel渐变色之CAGradientLayer渐变

效果图

函数代码:  有关CAGradientLayer知识见上篇文章

#pragma mark 字体动画  解锁

-(void)lableAnmation

{

self.backgroundColor=[UIColor grayColor];

CAGradientLayer *theGtradient=[CAGradientLayer layer];

theGtradient.frame=CGRectMake(0, 200, CGRectGetWidth(self.frame), 66);

[self.layer addSublayer:theGtradient];

theGtradient.colors=@[

(__bridge id)[UIColor blackColor].CGColor,

(__bridge id)[UIColor whiteColor].CGColor,

(__bridge id)[UIColor blackColor].CGColor

];

theGtradient.locations=@[@.25,@.5,@.75];

theGtradient.startPoint=CGPointMake(0, 0.5);

theGtradient.endPoint=CGPointMake(1., 0.5);

//动画

CABasicAnimation *theAnima=[CABasicAnimation animationWithKeyPath:@"locations"];

theAnima.fromValue=@[@0,@0,@0.25];

theAnima.toValue=@[@0.25,@1,@1];

theAnima.duration=2.5;

theAnima.repeatCount=HUGE;

[theGtradient addAnimation:theAnima forKey:@"locations"];

//uilable文字

UILabel *theUnlock=[[UILabel alloc]initWithFrame:theGtradient.bounds];

[self addSubview:theUnlock];

theUnlock.alpha=.5;

theUnlock.text=@"滑动解锁 >>";

theUnlock.textAlignment=NSTextAlignmentCenter;

theUnlock.font=[UIFont boldSystemFontOfSize:30];

theGtradient.mask=theUnlock.layer;

}