常用代码

1.设置渐变色

#pragma mark - 渐变色设置
- (void)configGraduallyColor {
    
    //CAGradientLayer是CALayer的一个特殊子类，用于生成颜色渐变的图层
    CAGradientLayer *gradientLayer = [CAGradientLayer layer];
    //colors 渐变的颜色
    gradientLayer.colors = @[(__bridge id)[UIColor greenColor].CGColor, (__bridge id)[UIColor yellowColor].CGColor, (__bridge id)[UIColor purpleColor].CGColor];
    //locations 渐变颜色的分割点
    gradientLayer.locations = @[@0.3, @0.5, @1.0];
    //startPoint&endPoint 颜色渐变的方向，范围在(0,0)与(1.0,1.0)之间，如(0,0)(1.0,0)代表水平方向渐变,(0,0)(0,1.0)代表竖直方向渐变
    gradientLayer.startPoint = CGPointMake(0, 0);
    gradientLayer.endPoint = CGPointMake(1.0, 0);
    gradientLayer.frame = CGRectMake(50, 100, 300, 100);
    [self.view.layer addSublayer:gradientLayer];
}