设置指定边界圆角

最近项目中需要用到一些视图的某些边界设置为圆角，比如指定一个长方形view，需要设置其左边为圆形，所以就封装一个类来实现指定边界的圆角

1，首先创建一个继承于UIView的分类（由于项目中我需设置一个button的圆角，所以命名为Btn）

2.在接口文件中设置接口

这里参数：distance 为需要设置圆角的那个边界的高度或宽度

#import <UIKit/UIKit.h>

typedef enum {
    ZSSideRoundLeft,
    ZSSideRoundRight,
    ZSSideRoundUp,
    ZSSideRoundDown
} ZSSideRound;

@interface UIView (ZSSideRoundBtn)

- (void)roundSide:(ZSSideRound)side distance:(CGFloat)distance;

@end

3.在.m中实现（在这里指定边界设置为半圆）

#import "UIView+ZSSideRoundBtn.h"

@implementation UIView (ZSSideRoundBtn)

- (void)roundSide:(ZSSideRound)side distance:(CGFloat)distance
{
    UIBezierPath* maskPath;

    if (side == ZSSideRoundLeft)
    {
        maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                         byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerBottomLeft)
                                               cornerRadii:CGSizeMake(distance/2, distance/2)];
    }
    else if (side == ZSSideRoundRight)
    {
        maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                         byRoundingCorners:(UIRectCornerTopRight | UIRectCornerBottomRight)
                                               cornerRadii:CGSizeMake(distance/2, distance/2)];
    }
    else if (side == ZSSideRoundUp)
    {
        maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                         byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerTopRight)
                                               cornerRadii:CGSizeMake(distance/2, distance/2)];
    }
    else
    {
        maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                         byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight)
                                               cornerRadii:CGSizeMake(distance/2, distance/2)];
    }

    // 创建形状图层,设置它的路径
    CAShapeLayer* maskLayer = [CAShapeLayer layer];
    maskLayer.frame = self.bounds;
    maskLayer.path = maskPath.CGPath;

    // 新创建的形状图层设置为图像视图层的面具
    self.layer.mask = maskLayer;

    [self.layer setMasksToBounds:YES];
}
@end

搞定，以后需要设置一些UIView的子类视图的边界为半圆时，直接引用就OK

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