UILabel颜色逐渐变化
@interface UIViewController ()
@property (weak, nonatomic) IBOutlet UIView *backView; //空间是用storyBoard创建的
@property (nonatomic, strong) CAGradientLayer* gradientLayer;
@end
@implementation UIViewController
- (void)viewDidLoad {
//设置Label的背景颜色渐变 要把label添加到一个View上
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, self.backView.frame.size.width, self.backView.frame.size.height)];
label.textAlignment = NSTextAlignmentCenter;
label.backgroundColor = [UIColor clearColor];
label.text = @"label背景颜色渐变";
label.font = [UIFont systemFontOfSize:17];
label.textColor = [UIColor greenColor];
[self.backView addSubview:label];
[self textGradientview:label1 bgVIew:self.backView gradientColors:@[(id)[self randomColor].CGColor, (id)[self randomColor].CGColor, (id)[self randomColor].CGColor] gradientStartPoint:CGPointMake(0, 1) endPoint:CGPointMake(1, 0)];
//设置label文字的颜色渐变 重新创建一个View
UILabel *label1 = [[UILabel alloc]initWithFrame:CGRectMake(60, 300, 300, 80)];
label1.textAlignment = NSTextAlignmentCenter;
label1.text = @"label字体的颜色渐变allalal";
label1.font = [UIFont systemFontOfSize:20];
label1.textColor = [UIColor greenColor];
[self.view addSubview:label1];
[self textGradientview:label1 bgVIew:self.view gradientColors:@[(id)[self randomColor].CGColor, (id)[self randomColor].CGColor, (id)[self randomColor].CGColor] gradientStartPoint:CGPointMake(0, 1) endPoint:CGPointMake(1, 1)];
//
NSTimer *timer = [NSTimer timerWithTimeInterval:.1 target:self selector:@selector(textColorChange) userInfo:nil repeats:YES];
[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
}
/**
@param view Label
@param bgVIew Label的父视图
@param colors 颜色数组
@param startPoint 开始的中心点
@param endPoint 结束的中心点
*/
-(void)textGradientview:(UIView *)view bgVIew:(UIView *)bgVIew gradientColors:(NSArray *)colors gradientStartPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint {
_gradientLayer = [CAGradientLayer layer];
_gradientLayer.frame = view.frame;
_gradientLayer.colors = colors;
_gradientLayer.startPoint = startPoint;
_gradientLayer.endPoint = endPoint;
[bgVIew.layer addSublayer:_gradientLayer];
_gradientLayer.mask = view.layer;
view.frame = _gradientLayer.bounds;
}
-(UIColor *)randomColor{
CGFloat r = arc4random_uniform(256) / 255.0;
CGFloat g = arc4random_uniform(256) / 255.0;
CGFloat b = arc4random_uniform(256) / 255.0;
return [UIColor colorWithRed:r green:g blue:b alpha:1];
}
// 定时器触发方法
-(void)textColorChange {
_gradientLayer.colors = @[(id)[self randomColor].CGColor,
(id)[self randomColor].CGColor,
(id)[self randomColor].CGColor];
}
@end