浏览document下所有图片资源
#define DOCUMENTS_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]
NSArray *fileList = [[[NSFileManager defaultManager] directoryContentsAtPath:DOCUMENTS_FOLDER]
????????????????pathsMatchingExtensions:[NSArray arrayWithObject:@"png"]] ;
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类似操作有很多，自己发挥
