iOS 给一个uiview设置shadow

给view设置shadow 主要是操作的caller上的，所以我们要先导入头文件

#import <QuartzCore/QuartzCore.h>

然后，在函数

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

    CALayer *layer = self.layer;

    [layer setBorderColor:[[UIColor yellowColor] CGColor]];//边框的颜色

    layer.shadowOffset = CGSizeMake(0, 3);

    layer.shadowRadius = 5.0;

    layer.shadowColor = [UIColor yellowColor].CGColor;//shadow的颜色

    layer.shadowOpacity = 0.8;

    [layer setBorderWidth:2.75];

}

touch结束后，设置回来

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

{

   

    CALayer *layer = self.layer;

//这里的rgba可以自己设置

    [layer setBorderColor:[[UIColor colorWithRed:0.588 green:0.737 blue:0.976 alpha:1.0] CGColor]];

    layer.shadowOffset = CGSizeMake(0, 8);

    layer.shadowRadius = 5.0;

    layer.shadowColor = [UIColor blackColor].CGColor;

    layer.shadowOpacity = 0.8;

    [layer setBorderWidth:2.75];

}