使用UIBezierPath添加投影效果

                        

代码：

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];
    
    [self.view addSubview:view];
    
    //添加View的阴影
    [self addShadowWithView:view];
    //[self addShadowWithView2:view];
}

//添加View的阴影
- (void)addShadowWithView:(UIView *)view{
    
    view.layer.shadowColor = [UIColor blackColor].CGColor;//shadowColor阴影颜色,默认为黑色
    view.layer.shadowOffset = CGSizeMake(4, 4);
    view.layer.shadowOpacity = 1.0;
    view.layer.shadowRadius = 3;
    
    //路径阴影
    UIBezierPath *path = [UIBezierPath bezierPath];
    
    float width = view.bounds.size.width;
    float height = view.bounds.size.height;
    float x = view.bounds.origin.x;
    float y = view.bounds.origin.y;
    
    CGPoint topLeft = CGPointMake(x, y);
    CGPoint topMiddle = CGPointMake(x + (width/2), y);
    CGPoint topRight = CGPointMake(x + width, y);
    
    CGPoint rightMiddle = CGPointMake(x + width, y + (height/2));
    
    CGPoint bottomRight = CGPointMake(x+width, y+height);
    CGPoint bottomMiddle = CGPointMake(x + (width/2), y + height);
    CGPoint bottomLeft = CGPointMake(x, y + height);
    
    CGPoint leftMiddle = CGPointMake(x, y + (height/2));
    
    [path moveToPoint:topLeft];
    //添加四个二元曲线
    [path addQuadCurveToPoint:topRight controlPoint:topMiddle];
    [path addQuadCurveToPoint:bottomRight controlPoint:rightMiddle];
    [path addQuadCurveToPoint:bottomLeft controlPoint:bottomMiddle];
    [path addQuadCurveToPoint:topLeft controlPoint:leftMiddle];
    
    view.layer.shadowPath = path.CGPath;
}

//添加View的阴影2
- (void)addShadowWithView2:(UIView *)view{
    
    //使用这种办法来设置投影,必须添加背景颜色或者边框颜色否则是无法显示的
    view.layer.borderColor = [UIColor blueColor].CGColor;
    view.layer.borderWidth = 1.0;
    
    view.layer.shadowColor = [UIColor blackColor].CGColor;
    view.layer.shadowOffset = CGSizeMake(4, 4);
    view.layer.shadowOpacity = 1.0;
    view.layer.shadowRadius = 2;
    
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end

实例代码：

Demo下载

参考链接：

http://blog.csdn.net/rhljiayou/article/details/10178723