1 //设置圆形cornerRadius，是宽或高的一半
2
3 _imageView.layer.masksToBounds = YES;
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7 CGFloat w = _imageView.frame.size.width / 2;
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9 _imageView.layer.cornerRadius = w;
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13 //设置边框宽度及颜色
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15 [_imageView.layersetBorderWidth:2];
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17 [_imageView.layersetBorderColor:[[UIColorwhiteColor]CGColor]];
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21 //圆角设置(cornerRadius = 125，我用的图片是250*250，250的一半：125)
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23 _imageView.layer.cornerRadius = 125;
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25 _imageView.layer.masksToBounds = YES;
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29 //自动适应，保持图片宽高比
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31 _imageView.contentMode = UIViewContentModeScaleAspectFit;
