UIImageViewを円形にマスクをかける

UIImageView+CircleMask.h

#import <UIKit/UIKit.h>

@interface UIImageView (CircleMask)
- (void)circleMask;
- (void)circleMaskBorderWitdh:(CGFloat)width color:(CGColorRef)color;
@end

UIImageView+CircleMask.m

@import QuartzCore;

#import "UIImageView+CircleMask.h"

@implementation UIImageView (CircleMask)

- (void)circleMask {
    CALayer *layer = self.layer;
    layer.cornerRadius = MAX(self.frame.size.width, self.frame.size.height) / 2.0;
    layer.masksToBounds = YES;
}

- (void)circleMaskBorderWitdh:(CGFloat)width color:(CGColorRef)color {
    [self circleMask];
    self.layer.borderWidth = width;
    self.layer.borderColor = color;
}

@end

how to use

import header file

#import "UIImageView+CircleMask.h"

set mask as

[imageView circleMask];

or with radius and color

[imageView circleMaskBorderWitdh:2.0 color:[[UIColor whiteColor] CGColor]];