文件的名称，包含了他的文件拓展名。如果这个图片是第一次被载入，那么这个方法将会在应用程序主束中寻找指定的名称。
The name of the file, including its filename extension. If this is the first time the image is being loaded, the method looks for an image with the specified name in the application's main bundle.
文件的名称，包含了他的文件拓展名。如果这个图片是第一次被载入，那么这个方法将会在应用程序主束中寻找指定的名称。
The name of the file, including its filename extension. If this is the first time the image is being loaded, the method looks for an image with the specified name in the application's main bundle.
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