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  • iOS开发-UIImageView的contentMode属性

    UIImageView 的contentMode这个属性是用来设置图片的显示方式,如居中、居右,是否缩放等,有以下几个常量可供设定:
    UIViewContentModeScaleToFill
    UIViewContentModeScaleAspectFit
    UIViewContentModeScaleAspectFill
    UIViewContentModeRedraw
    UIViewContentModeCenter
    UIViewContentModeTop
    UIViewContentModeBottom
    UIViewContentModeLeft
    UIViewContentModeRight
    UIViewContentModeTopLeft
    UIViewContentModeTopRight
    UIViewContentModeBottomLeft
    UIViewContentModeBottomRight

    注意以上几个常量,凡是没有带Scale的,当图片尺寸超过 ImageView尺寸时,只有部分显示在ImageView中。UIViewContentModeScaleToFill属性会导致图片变形。UIViewContentModeScaleAspectFit会保证图片比例不变,而且全部显示在ImageView中,这意味着ImageView会有部分空白。UIViewContentModeScaleAspectFill也会证图片比例不变,但是是填充整个ImageView的,可能只有部分图片显示出来。

    例如:

    1.显示正常的图片

    _image = [[UIImageView alloc] init];  
    image = [UIImage imageNamed:@"12.jpeg"];  
    _image.backgroundColor = [UIColor brownColor];  
    _image.clipsToBounds = YES;  
    _image.frame = CGRectMake(100, 130, 100, 100);  
    _image.contentMode = UIViewContentModeScaleToFill;  
    [self.view addSubview:_image]; 
    

    2. 

    1 _image.contentMode = UIViewContentModeScaleAspectFill;  

    3.

    1 _image.contentMode = UIViewContentModeScaleAspectFit;  

    ref http://blog.csdn.net/sqc3375177/article/details/17415635 

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  • 原文地址:https://www.cnblogs.com/feiling/p/4745097.html
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