1,为属性赋值
#import <UIKit/UIKit.h> @interface UIViewController (RunTime) - (BOOL)setPropertyValue:(id)propertyValue propertyName:(NSString *)propertyName ; @end
#import "UIViewController+RunTime.h" @implementation UIViewController (Change) /** 给指定property赋值;若property不存在,则不做 @param propertyValue property值, propertyName:property的名字 */ - (BOOL)setPropertyValue:(id)propertyValue propertyName:(NSString *)propertyName { BOOL isPropertyExist= NO; unsigned int methodCount = 0; Ivar * ivars = class_copyIvarList([self class], &methodCount); for (unsigned int i = 0; i < methodCount; i ++) { Ivar ivar = ivars[i]; const char * name = ivar_getName(ivar); const char * type = ivar_getTypeEncoding(ivar); NSLog(@"%@拥有的成员变量的类型为%s,名字为 %s ",NSStringFromClass([self class]),type, name); NSString *tempPropertyName = [[NSString alloc] initWithCString:name encoding:NSUTF8StringEncoding]; if([tempPropertyName isEqualToString:propertyName]) { isPropertyExist = YES; object_setIvar(self, ivar,propertyValue); NSLog(@"object_setIvar:%@",object_getIvar(self, ivar)); break; } } return isPropertyExist; } @end
2,方法交换
#import <UIKit/UIKit.h> @interface UIViewController (Reachability) /** 将检测网络的函数替换,不做任何事情 使用方法:viewWillAppear中调用该函数,将EcoInitTools类中的reachabilityChanged方法实现替换成doNothing函数实现, viewWillDisappear中再替换回来。 */ - (void)changeReachability; @end #import "UIViewController+Reachability.h" @implementation UIViewController (Reachability) + (void)load { EcoLog(@"UIViewController (Reachability):%@",NSStringFromClass([self class])); } /** 替换的函数 */ - (void)doNothing { NSLog(@"doNothing"); } - (void)changeReachability { Class ecoTools = NSClassFromString(@"EcoInitTools"); // 获取reachabilityChanged方法地址 Method doSomeThingMethod = class_getInstanceMethod(ecoTools, @selector(reachabilityChanged:)); Method doNothingMethod = class_getInstanceMethod([self class], @selector(doNothing)); // 交换方法地址,相当于交换实现方式 method_exchangeImplementations(doSomeThingMethod, doNothingMethod); } @end