IOS应用开发16——UIViewContentMode各类型参数样式效果

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UIView有一个属性：contentMode，用来表示如何显示内容，取值参数为：

typedef NS_ENUM(NSInteger, UIViewContentMode) {    UIViewContentModeScaleToFill,    UIViewContentModeScaleAspectFit,      // contents scaled to fit with fixed aspect. remainder is transparent    UIViewContentModeScaleAspectFill,     // contents scaled to fill with fixed aspect. some portion of content may be clipped.    UIViewContentModeRedraw,              // redraw on bounds change (calls -setNeedsDisplay)    UIViewContentModeCenter,              // contents remain same size. positioned adjusted.    UIViewContentModeTop,    UIViewContentModeBottom,    UIViewContentModeLeft,    UIViewContentModeRight,    UIViewContentModeTopLeft,    UIViewContentModeTopRight,    UIViewContentModeBottomLeft,    UIViewContentModeBottomRight,};

具体的显示效果怎么样呢，有图有真相，我们以UIImageView为示例来说明歌参数的效果，基本代码如下：

_photoView = [UIImageView new];_photoView.frame = CGRectMake(10, kMarginTop+5,                              kScreenWidth - 10*2, 240);_photoView.backgroundColor = [UIColor greenColor];NSString *str = @"http://i5.hexunimg.cn/2014-09-18/168589835.jpg";_photoView setImageURLStr:str placeholder:nil]_photoView.contentMode = UIViewContentModeScaleToFill;[self.view addSubview:_photoView];

附效果图，使用参数见标题

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