清理項目緩存圖片

得到圖片下載的路徑，經過NSFileManager removeItemAtPath
NSString *localPath = [NSHomeDirectory()stringByAppendingPathComponent:@"Documents"] ;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *fileArray = [fileManager contentsOfDirectoryAtPath:localPath error:nil];
for (NSString *str in fileArray) {
NSString *filePath = [localPath stringByAppendingPathComponent:str];
[fileManager removeItemAtPath:filePath error:nil];
}
刪除documents目錄下的全部文件

若有錯誤請大神指出。