通過程式碼設定UIView的任意一個角為圓角

先建立RectCorner 繼承自UIView  

.h程式碼

#import <UIKit/UIKit.h>

@interface RectCorner : UIView

/**

 * 頂部圓角

 */

- (void)setCornerOnTop;

/**

 *  底部圓角

 */

- (void)setCornerOnBottom;

/**

 *  全部圓角

 */

- (void)setAllCorner;

@end

.m程式碼

#import "RectCorner.h"

@implementation RectCorner

- (void)setCornerOnTop {

    UIBezierPath *maskPath;

    maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds

                                     byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerTopRight)

                                           cornerRadii:CGSizeMake(8.0, 8.0)];

    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

    maskLayer.frame = self.bounds;

    maskLayer.path = maskPath.CGPath;

    self.layer.mask = maskLayer;

}

- (void)setCornerOnBottom {

    UIBezierPath *maskPath;

    maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds

                                     byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight)

                                           cornerRadii:CGSizeMake(8.0, 8.0)];

    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

    maskLayer.frame = self.bounds;

    maskLayer.path = maskPath.CGPath;

    self.layer.mask = maskLayer;

}

- (void)setAllCorner {

    UIBezierPath *maskPath;

    maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds

                                          cornerRadius:8.0];

    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

    maskLayer.frame = self.bounds;

    maskLayer.path = maskPath.CGPath;

    self.layer.mask = maskLayer;

}

- (void)setNoneCorner {

    self.layer.mask = nil;

}

@end

使用方法

#import "ViewController.h"

#import "RectCorner.h"

@interface ViewController ()

@property (nonatomic,strong)RectCorner *rc;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    //四角全不為圓角

    RectCorner *rc = [[RectCorner alloc]init];

    rc.backgroundColor = [UIColor magentaColor];

    rc.frame = CGRectMake(100, 100, 100, 100);

    [self.view addSubview:rc];

    [rc setAllCorner];

    //底部兩個角為圓角

    RectCorner *rc1 = [[RectCorner alloc]init];

    rc1.backgroundColor = [UIColor magentaColor];

    rc1.frame = CGRectMake(100, 220, 100, 100);

    [self.view addSubview:rc1];

    [rc1 setCornerOnBottom];

    //頂部兩個角為圓角

    RectCorner *rc2 = [[RectCorner alloc]init];

    rc2.backgroundColor = [UIColor magentaColor];

    rc2.frame = CGRectMake(100, 350, 100, 100);

    [self.view addSubview:rc2];

    [rc2 setCornerOnBottom];

    //任意角為圓角

    UIView *bgView = [[UIView alloc]init];

    bgView.frame = CGRectMake(220, 200, 50, 50);

    bgView.backgroundColor = [UIColor purpleColor];

    bgView.userInteractionEnabled = YES;

    [self.view addSubview:bgView];

    /**

     UIRectCornerTopLeft 上左

     UIRectCornerTopRight上右

     UIRectCornerBottomRight下右

     UIRectCornerBottomRight下右

     */

    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:bgView.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(10, 10)];

    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

    maskLayer.frame = bgView.bounds;

    maskLayer.path = maskPath.CGPath;

    bgView.layer.mask = maskLayer;

}

@end