Use method swizzling to extract duplicate operations

Use method swizzling to extract duplicate operations

by Wusheying

Repeat operations such as data escalation, public features, and so on.

1. Establishing the category of Uiviewcontroller

2. Code:

#import "Uiviewcontroller+analytics.h" #import <objc/runtime.h>  @implementation uiviewcontroller (Analytics)+ (void) Load {Static dispatch_once_tOncetoken;dispatch_once(&oncetoken, ^{class class = [ SelfClass]; SEL Originalselector =@selector(viewwillappear:); SEL Swizzledselector =@selector(ana_viewwillappear:);        Method Originalmethod = Class_getinstancemethod (class, Originalselector); Method Swizzledmethod = Class_getinstancemethod (class, Swizzledselector);BOOLSuccess = Class_addmethod (class, Originalselector, Method_getimplementation (Swizzledmethod), method_gettypeencoding (Swizzledmethod));if(success) {Class_replacemethod (class, Swizzledselector, Method_getimplementation (Originalmethod), method_gettypeencoding        (Originalmethod)); }Else{method_exchangeimplementations (Originalmethod, Swizzledmethod); }    });} - (void) Ana_viewwillappear: (BOOL) Animated {[ SelfAna_viewwillappear:animated];NSLog(@"Ana_viewwillappear");NSLog(@"%@", Self);    Mta_report (); [ SelfHidenavigationshadowline];}@end

3. Output
2015-06-16 09:17:59.838 test[37292:2748514] Ana_viewwillappear
2015-06-16 09:17:59.838 test[37292:2748514] viewcontroller:0x7fb7515291c0>

Use method swizzling to extract duplicate operations