Objective-C Class (class Extension: class categories)

1 Preface

The objective-C category provides a way to dynamically add new features to existing classes, instead of adding new features, categories can also be used as private functions of classes in Beijing. The header file and the implemented file name are in the same format as "existing class name + extension", for example, nsstring + vowelscounting. h.

2. code example

Main. m

# Import <Foundation/Foundation. h> # import "nsstring + vowelscounting. H "int main (INT argc, const char * argv []) {@ autoreleasepool {nsstring * STR = [[nsstring alloc] init]; [STR vowelscount];} return 0 ;}

Running result

14:07:00. 925 categorytest [485: 303] category test!

3 conclusion

The above is all content and I hope it will help you.

DEMO code download: http://download.csdn.net/detail/u010013695/5396699