设置view的圆角的类别category

UIView+CornerRadius.h

#import 

typedef NS_ENUM(NSInteger,CornerType){
    CornerTypeTopLeft  =0,
    CornerTypeTopRight,
    CornerTypeBottomLeft,
    CornerTypeBottomRight,
    CornerTypeTop,
    CornerTypeLeft,
    CornerTypeRight,
    CornerTypeBottom,
    CornerTypeNoTopLeft,
    CornerTypeNoTopRight,
    CornerTypeNoBottomLeft,
    CornerTypeNoBottomRight,
    CornerTypeAll
};
@interface UIView (CornerRadius)
- (void)setCornerType:(CornerType)type cornerRadius:(CGFloat)cornerRadius;
@end

UIView+CornerRadius.m

#import "UIView+CornerRadius.h"

@implementation UIView (CornerRadius)
- (void)setCornerType:(CornerType)type cornerRadius:(CGFloat)cornerRadius
{
    CGSize cornerSize = CGSizeMake(cornerRadius, cornerRadius);
    UIRectCorner corner;
    switch (type) {
        case CornerTypeTopLeft:
            corner = UIRectCornerTopLeft;
            break;
        case CornerTypeTopRight:
            corner = UIRectCornerTopRight;
            break;
        case CornerTypeBottomLeft:
            corner = UIRectCornerBottomLeft;
            break;
        case CornerTypeBottomRight:
            corner = UIRectCornerBottomRight;
            break;
        case CornerTypeTop:
            corner = UIRectCornerTopRight|UIRectCornerTopLeft;
            break;
        case CornerTypeLeft:
            corner = UIRectCornerTopLeft|UIRectCornerBottomLeft;
            break;
        case CornerTypeBottom:
            corner = UIRectCornerBottomLeft|UIRectCornerBottomRight;
            break;
        case CornerTypeRight:
            corner = UIRectCornerBottomRight|UIRectCornerTopRight;
            break;
        case CornerTypeNoTopLeft:
            corner = UIRectCornerBottomLeft|UIRectCornerTopRight|UIRectCornerBottomRight;
            break;
        case CornerTypeNoTopRight:
            corner = UIRectCornerBottomRight|UIRectCornerBottomLeft|UIRectCornerTopLeft;
            break;
        case CornerTypeNoBottomLeft:
            corner = UIRectCornerTopLeft|UIRectCornerBottomRight|UIRectCornerTopRight;
            break;
        case CornerTypeNoBottomRight:
            corner = UIRectCornerTopLeft|UIRectCornerTopRight|UIRectCornerBottomLeft;
            break;
        case CornerTypeAll:
            corner = UIRectCornerAllCorners;
            break;
        default:
            break;
    }
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corner cornerRadii:cornerSize];
    CAShapeLayer *layer = [[CAShapeLayer alloc]init];
    layer.path = path.CGPath;
    layer.frame = self.bounds;
    self.layer.mask = layer;
}
@end