UIImage加阴影

淩亂°似流年 2023-10-18 10:36 31阅读 0赞

\#import <QuartzCore/QuartzCore.h>  
一、给图片加上阴影

UIImageView*pageContenterImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"onePageApple.png"]];
            
            //添加边框
            
            CALayer*layer = [pageContenterImageView layer];
            
            layer.borderColor= [[UIColor whiteColor]CGColor];
            
            layer.borderWidth=0.0f;
            
            //添加四个边阴影
            
            pageContenterImageView.layer.shadowColor= [UIColor blackColor].CGColor;
            
            pageContenterImageView.layer.shadowOffset=CGSizeMake(0,0);
            
            pageContenterImageView.layer.shadowOpacity=0.5; 
            
            pageContenterImageView.layer.shadowRadius=5.0;
            
            //添加两个边阴影
            
            //pageContenterImageView.layer.shadowColor = [UIColor blackColor].CGColor;
            
            //    pageContenterImageView.layer.shadowOffset = CGSizeMake(2, 2);
            
            //    pageContenterImageView.layer.shadowOpacity = 0.5; 
            
            //    pageContenterImageView.layer.shadowRadius = 2.0;
            
            //-------------
            
            阴影渲染会严重消耗内存 ,导致程序咔叽.
            
            /*阴影效果*/
            
            //添加边框
            
            CALayer*layer = [self.pageContenter layer];
            
            layer.borderColor= [[UIColorwhiteColor]CGColor];
            
            layer.borderWidth=0.0f;
            
            //添加四个边阴影
            
            self.pageContenter.layer.shadowColor= [UIColorblackColor].CGColor;//阴影颜色
            
            self.pageContenter.layer.shadowOffset=CGSizeMake(0,0);//阴影偏移
            
            self.pageContenter.layer.shadowOpacity=0.5;//阴影不透明度
            
            self.pageContenter.layer.shadowRadius=5.0;//阴影半径
            
            //添加两个边阴影
            
            //self.pageContenter.layer.shadowColor = [UIColor blackColor].CGColor;
            
            //self.pageContenter.layer.shadowOffset = CGSizeMake(2, 2);
            
            //self.pageContenter.layer.shadowOpacity = 0.5; 
            
            //self.pageContenter.layer.shadowRadius = 2.0;

二、给视图加上阴影

UIView * content=[[UIView alloc] initWithFrame:CGRectMake(100, 250, 503, 500)]; 
        content.backgroundColor=[UIColor orangeColor];
        //content.layer.shadowOffset=10;
        
        
        content.layer.shadowOffset = CGSizeMake(5, 3);
        content.layer.shadowOpacity = 0.6;
        content.layer.shadowColor = [UIColor blackColor].CGColor;
        
        
        [self.window addSubview:content];