Loading图代码

CAReplicatorLayer *repLayer = [CAReplicatorLayer layer];repLayer.bounds = CGRectMake(0, 0, 100, 100);repLayer.position = CGPointMake(self.view.frame.size.width/2, self.view.frame.size.height/2);repLayer.backgroundColor = [UIColor colorWithRed:0.1 green:0.1 blue:0.1 alpha:0.2].CGColor;repLayer.cornerRadius = 10;[self.view.layer addSublayer:repLayer];CALayer *dotLayer = [CALayer layer];dotLayer.bounds = CGRectMake(0, 0, 15, 5);dotLayer.position = CGPointMake(15, repLayer.frame.size.height/2);dotLayer.backgroundColor = [UIColor colorWithRed:0.1 green:0.1 blue:0.1 alpha:0.6].CGColor;dotLayer.cornerRadius = 2.5;[repLayer addSublayer:dotLayer];int count = 12;repLayer.instanceCount = count;CGFloat angel = 2*M_PI / count;repLayer.instanceTransform = CATransform3DMakeRotation(angel, 0, 0, 1);CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"opacity"];anim.duration = 1.0;anim.fromValue = @0.6;anim.toValue = @0;anim.repeatCount = MAXFLOAT;repLayer.instanceDelay = 1.0/count;[dotLayer addAnimation:anim forKey:nil];