我正在绘制圆形头像图片,只需将cornerRadius
应用于UIImageView
的图层,并通过使用borderWith
和borderColor
添加边框。代码如下:
self.layer.masksToBounds = YES;
self.layer.cornerRadius = imageDimension / 2.f;
self.layer.borderWidth = 1.f;
self.layer.borderColor = borderColor.CGColor;
这个方法很好,但是有一个微小但明显的问题,就是内容会超出边框,如下图所示:
有没有一种方法可以将边框向外扩展几个1/10点,或者将内容缩进比边框更多?
解决方案
感谢FelixLam,我想出了一个好的解决方案,并将其留在这里供后人参考:
@interface MMRoundImageViewWithBorder : UIView
- (id)initWithImage:(UIImage *)image borderWidth:(CGFloat)borderWidth;
@property (strong, nonatomic) UIImageView *imageView;
@property (assign, nonatomic) CGFloat borderWidth;
@property (strong, nonatomic) UIColor *borderColor;
@end
@implementation MMRoundImageViewWithBorder
- (id)initWithImage:(UIImage *)image borderWidth:(CGFloat)borderWidth {
if (self = [super init]) {
self.borderWidth = borderWidth;
self.borderColor = UIColor.whiteColor;
self.imageView = [[UIImageView alloc] initWithImage:image];
[self addSubview:self.imageView];
self.imageView.layer.masksToBounds = YES;
self.layer.masksToBounds = YES;
}
return self;
}
- (void)setBorderColor:(UIColor *)borderColor {
_borderColor = borderColor;
self.backgroundColor = borderColor;
}
- (void)layoutSubviews {
[super layoutSubviews];
[self refreshDimensions];
}
- (void)refreshDimensions {
self.layer.cornerRadius = CGRectGetWidth(self.bounds) / 2.f;
self.imageView.frame = CGRectInset(self.bounds, _borderWidth, _borderWidth);
self.imageView.layer.cornerRadius = CGRectGetWidth(self.imageView.bounds) / 2.f;
}
- (void)setBorderWidth:(CGFloat)borderWidth {
_borderWidth = borderWidth;
[self refreshDimensions];
}
- (void)setFrame:(CGRect)frame {
[super setFrame:frame];
[self refreshDimensions];
}
@end