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关于如何设置阴影的同时裁剪图片

2018-01-14 21:51 260 查看
具体实现的套路有两种  

1、在图层下方在添加一个背景图层， 分别设置。

self.layerView1.layer.cornerRadius = 20.0f;
self.layerView2.layer.cornerRadius = 20.0f;

//add a border to our layers
self.layerView1.layer.borderWidth = 5.0f;
self.layerView2.layer.borderWidth = 5.0f;

//add a shadow to layerView1
self.layerView1.layer.shadowOpacity = 0.5f;
self.layerView1.layer.shadowOffset = CGSizeMake(0.0f, 5.0f);
self.layerView1.layer.shadowRadius = 5.0f;

//add same shadow to shadowView (not layerView2)
self.shadowView.layer.shadowOpacity = 0.5f;
self.shadowView.layer.shadowOffset = CGSizeMake(0.0f, 5.0f);
self.shadowView.layer.shadowRadius = 5.0f;

//enable clipping on the second layer
self.layerView2.layer.masksToBounds = YES;


2、通过layer的shadowPath设置

@interface ViewController ()

@property (nonatomic, weak) IBOutlet UIView *layerView1;
@property (nonatomic, weak) IBOutlet UIView *layerView2;
@end

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];

//enable layer shadows
self.layerView1.layer.shadowOpacity = 0.5f;
self.layerView2.layer.shadowOpacity = 0.5f;

//create a square shadow
CGMutablePathRef squarePath = CGPathCreateMutable();
CGPathAddRect(squarePath, NULL, self.layerView1.bounds);
self.layerView1.layer.shadowPath = squarePath; CGPathRelease(squarePath);

//create a circular shadow
CGMutablePathRef circlePath = CGPathCreateMutable();
CGPathAddEllipseInRect(circlePath, NULL, self.layerView2.bounds);
self.layerView2.layer.shadowPath = circlePath; CGPathRelease(circlePath);
}
@end

如果是一个矩形或者是圆，用
CGPath
会相当简单明了。但是如果是更加复杂一点的图形，
UIBezierPath
这个类会更加合适。
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