iOS通过Category实现UIView渐变的背景颜色

项目中有很多View和Button需要设置渐变的背景颜色，所以写了一个Category来方便调用。

- (void)setGradientBackgroundColor
{
    //创建一个渐变的图层
    CAGradientLayer *gradientLayer = [CAGradientLayer layer];
    gradientLayer.colors = @[(__bridge id)[UIColor redColor].CGColor, (__bridge id)[UIColor blueColor].CGColor];
    gradientLayer.locations = @[@0, @1.0];
    gradientLayer.startPoint = CGPointMake(0, 0);
    gradientLayer.endPoint = CGPointMake(1.0, 0);
    gradientLayer.frame = self.bounds;
    gradientLayer.name = @"gradientLayer";
    
    //生成一个image
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.opaque, 0.0);
    [gradientLayer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    //设置背景颜色
    self.backgroundColor = [UIColor colorWithPatternImage:img];
}

调用方式，import这个category，在需要设置背景颜色的时候调用就可以了

#import "UIView+Gradient.h"
@interface ViewController ()
@property (nonatomic, strong)UIView *tempView;
@property (nonatomic, strong)UIView *childView;
@end

@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];

    _tempView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];
    [self.view addSubview:_tempView];
    
    _childView = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 100, 100)];
    _childView.backgroundColor = [UIColor whiteColor];
    [_tempView addSubview:_childView];
    
    [_tempView setGradientBackgroundColor];
}
@end

效果图

参考链接
ios实现颜色渐变的几种方法