NSBundle
bundle 是一个目录，包含了图片等资源
NSBundle *mainBundle = [NSBundle mainBundle];
去目录里面读取文件，然后用 UIImageView 展示：
通过 pathForResource 和 ofType 来获取图片
NSString *imagePath = [mainBundle pathForResource: @"***" ofType: @"png"];
用 UIImage initWIthContentsOfFile 传入一个 imagePath
UIImage *image = [[UIImage alloc] initWIthContentsOfFile: imagePath];
用 UIImageView initWIthImage
UIImageView *imageView = [[UIImageView alloc] initWithImage: image];
[self.view addSubview: imageView];
扩展：
https://www.jianshu.com/p/34cda6a121db
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