深入理解 [NSBundle mainBundle]

转自: http://www.cnblogs.com/iihe602/archive/2013/01/17/2865280.html

1、[NSBundle mainBundle],文件夹其实是Group,如左侧的树形文件管理器

深入理解 [NSBundle mainBundle]_第1张图片

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" ];

2、使用文件夹的时候,Build结果

深入理解 [NSBundle mainBundle]_第2张图片

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

深入理解 [NSBundle mainBundle]_第3张图片

 

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);

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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