这应该返回应用文件夹中所有 png 的数组.

This should return an array of all your pngs in your app folder.

[[NSBundle mainBundle] pathsForResourcesOfType:@"png" inDirectory:nil];

注意* 该数组包含路径.如果您只想要名称在该数组的特定索引上使用 - (NSString *)lastPathComponent，即

Note* The array contains paths. If you just want the name use - (NSString *)lastPathComponent on a specific index of that array, i.e.

NSString *imgName = [[imgArray objectAtIndex:0]lastPathComponent]; //myImage.png