自定义一个切圆角View

#import <UIKit/UIKit.h>
typedef enum : NSUInteger {
    LEFT_RIGHT_TOP_BOTTOM,  //四个角
    TOP_LEFT_RIGHT,         //上两个角
    BOTTOM_LEFT_RIGHT,      //下两个角
} RADUIS_TYPE;              //角位置
@interface RectRaduisView : UIView
//要绘制的圆角数
@property (nonatomic,assign)CGFloat d_readius;
//绘制角位置的方法
@property (nonatomic,assign)RADUIS_TYPE raduisType;
@end

#import "RectRaduisView.h"
@implementation RectRaduisView{
    CAShapeLayer *_shapLayer;
    UIBezierPath *_bezierPath;
}
-(instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        _d_readius = 0.0f;
        _raduisType = LEFT_RIGHT_TOP_BOTTOM
        _shapLayer = [CAShapeLayer layer];
        _bezierPath = [UIBezierPath bezierPath];
        _shapLayer.path = _bezierPath.CGPath;
        [self.layer addSublayer:_shapLayer];
    }
    return self;
}
-(void)layoutSubviews
{
    [super layoutSubviews];
    [_bezierPath removeAllPoints];
    CGFloat width = CGRectGetWidth(self.bounds);
    CGFloat height = CGRectGetHeight(self.bounds);
    CGPoint point0 = CGPointMake(0, 0);
    CGPoint point1 = CGPointMake(self.d_readius, 0);
    CGPoint point2 = CGPointMake(width - self.d_readius, 0);
    
    CGPoint center1 =CGPointMake(width - self.d_readius, self.d_readius);
    //右上角
    CGPoint point3 = CGPointMake(width, 0);
    
    CGPoint point4 = CGPointMake(width,height - self.d_readius);
    
    CGPoint center2 =CGPointMake(width - self.d_readius, height - self.d_readius);
    //右下角
    CGPoint point5 = CGPointMake(width,height);
    
    CGPoint point6 = CGPointMake(self.d_readius,height);
    
    CGPoint center3 =CGPointMake(self.d_readius, height - self.d_readius);
    //左下角
    CGPoint point7 = CGPointMake(0,height);
    
    CGPoint point8 = CGPointMake(0,self.d_readius);
    
    CGPoint center4 =CGPointMake(self.d_readius, self.d_readius);

    if (self.raduisType==LEFT_RIGHT_TOP_BOTTOM) {
        //四个角
        [_bezierPath moveToPoint:point1];
        [_bezierPath addLineToPoint:point2];
        //第一个圆角  右上
        [_bezierPath addArcWithCenter:center1 radius:self.d_readius startAngle:-M_PI_2 endAngle:0 clockwise:YES];
        [_bezierPath addLineToPoint:point4];
        //右下
        [_bezierPath addArcWithCenter:center2 radius:self.d_readius startAngle:0 endAngle:M_PI_2 clockwise:YES];
        [_bezierPath addLineToPoint:point6];
        //左下
        [_bezierPath addArcWithCenter:center3 radius:self.d_readius startAngle:M_PI_2 endAngle:M_PI clockwise:YES];
        [_bezierPath addLineToPoint:point8];
        //左下
        [_bezierPath addArcWithCenter:center4 radius:self.d_readius startAngle:M_PI endAngle:M_PI*3/2.0f clockwise:YES];
        
    }else if (self.raduisType==TOP_LEFT_RIGHT){
        //上 两个
        [_bezierPath moveToPoint:point1];
        [_bezierPath addLineToPoint:point2];
        //第一个圆角  右上
        [_bezierPath addArcWithCenter:center1 radius:self.d_readius startAngle:-M_PI_2 endAngle:0 clockwise:YES];
        [_bezierPath addLineToPoint:point4];
        //右下
        [_bezierPath addLineToPoint:point5];
        [_bezierPath addLineToPoint:point6];
        //左下
        [_bezierPath addLineToPoint:point7];
        [_bezierPath addLineToPoint:point8];
        //左下
        [_bezierPath addArcWithCenter:center4 radius:self.d_readius startAngle:M_PI endAngle:M_PI*3/2.0f clockwise:YES];
    }else if (self.raduisType==BOTTOM_LEFT_RIGHT){
        //下两个
        [_bezierPath moveToPoint:point0];
        [_bezierPath addLineToPoint:point1];
        [_bezierPath addLineToPoint:point2];
        [_bezierPath addLineToPoint:point3];
        [_bezierPath addLineToPoint:point4];
        //右下
        [_bezierPath addArcWithCenter:center2 radius:self.d_readius startAngle:0 endAngle:M_PI_2 clockwise:YES];
        [_bezierPath addLineToPoint:point6];
        //左下
        [_bezierPath addArcWithCenter:center3 radius:self.d_readius startAngle:M_PI_2 endAngle:M_PI clockwise:YES];
        [_bezierPath addLineToPoint:point8];
        //左上
        [_bezierPath addLineToPoint:point0];
    }
    
    _shapLayer.path = _bezierPath.CGPath;
    _shapLayer.strokeColor = [UIColor clearColor].CGColor;
    
    _shapLayer.fillColor =self.backgroundColor.CGColor;
    self.layer.mask = _shapLayer;
}
-(void)setRaduisType:(RADUIS_TYPE)raduisType
{
    _raduisType = raduisType;
    [self layoutSubviews];
}
@end