1、[NSBundle mainBundle]，文件夹其实是Group，如左侧的树形文件管理器
Build之后，文件直接就复制到了根目录下，于是读取的方法，应该是这样：
NSString
*earth = [[
NSBundle
mainBundle] pathForResource:@
"Brad Cox"
ofType:@
"png"
];
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2、使用文件夹的时候，Build结果
依然使用同样的方法，不需要制定文件夹路径
//inDirectory参数可有可无
NSString *earth = [[NSBundle mainBundle] pathForResource:@"Matthijs" ofType:@"png" inDirectory:@"Images/MoreImages"]; NSString *earth = [[NSBundle mainBundle] pathForResource:@"Matthijs" ofType:@"png"];
编译之后，mainBundle的资源都是放到RootFolder下，所以，可以直接访问，不要指定内部路径
3、使用其他的Bundle
NSString
*resourceBundle = [[
NSBundle
mainBundle] pathForResource:@
"Resources"
ofType:@
"bundle"
];
NSLog
(@
"resourceBundle: %@"
, resourceBundle);
NSString
*earth = [[
NSBundlebundleWithPath
:resourceBundle] pathForResource:@
"Matthijs"
ofType:@
"jpg"
inDirectory:@
"Images/MoreImages"
];
NSLog
(@
"path: %@"
, earth);
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使用Custom bundle，访问内部的子文件夹，需要指定inDirectory参数，这个mainBundle不同，这是为何？
注意：Since
bundles other than the main bundle can have folders embedded inside them, to access
files inside folders of a bundle other than the main bundle it is best to use the pathFor
Resource:ofType:inDirectory: method of
NSBundle
to explicitly specify the folder in
which a specific file/resource exists.
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