Objective-C Runtime技术调研(五)

一、增加新技能篇

TridonLee要通过Category和Associated Objects增加技能了，快看！

创建TLPeople+Associated.h文件如下：

#import"TLPeople.h"

typedefvoid(^CodingCallBack)();

@interfaceTLPeople (Associated)

@property(nonatomic,strong)NSNumber*associatedBust;//胸围

@property(nonatomic,copy)CodingCallBackassociatedCallBack;//写代码

@end

TLPeople+Associated.m如下:

#import"TLPeople+Associated.h"

#if TARGET_IPHONE_SIMULATOR

#import

#else

#import

#import

#endif

@implementationTLPeople (Associated)

-(void)setAssociatedBust:(NSNumber*)associatedBust

{

//设置关联对象

objc_setAssociatedObject(self,@selector(associatedBust), associatedBust,OBJC_ASSOCIATION_RETAIN_NONATOMIC);

}

-(NSNumber*)associatedBust

{

//得到关联对象

returnobjc_getAssociatedObject(self,@selector(associatedBust));

}

-(void)setAssociatedCallBack:(CodingCallBack)associatedCallBack

{

objc_setAssociatedObject(self,@selector(associatedCallBack), associatedCallBack,OBJC_ASSOCIATION_COPY_NONATOMIC);

}

-(CodingCallBack)associatedCallBack

{

returnobjc_getAssociatedObject(self,@selector(associatedCallBack));

}

@end

在main.m中运行以下代码

#import

#import "TLPeople.h"

#import "TLPeople+Associated.h"

int main(intargc,constchar* argv[]) {

@autoreleasepool{

TLPeople*tlTeacher = [[TLPeoplealloc]init];

tlTeacher.name=@"TridonLee";

tlTeacher.age=18;

[tlTeachersetValue:@"Teacher"forKey:@"occupation"];

tlTeacher.associatedBust=@(90);

tlTeacher.associatedCallBack= ^(){

NSLog(@"TridonLee Teacher要写代码了！");

};

tlTeacher.associatedCallBack();

NSDictionary*propertyResultDic = [tlTeacherallProperties];

for(NSString*propertyNameinpropertyResultDic.allKeys) {

NSLog(@"propertyName:%@, propertyValue:%@",propertyName, propertyResultDic[propertyName]);

}

NSDictionary*methodResultDic = [tlTeacherallMethods];

for(NSString*methodNameinmethodResultDic.allKeys) {

NSLog(@"methodName:%@, argumentsCount:%@", methodName, methodResultDic[methodName]);

}

}

return0;

}

这次运行结果多出了一个associatedBust（胸围）和一个associatedCallBack（写代码）属性。

如图：

我们成功的给TridonLee添加个一个胸围的属性和一个写代码的回调，但是添加属性没有什么意义，我们平时在开发过成功中用的比较多的就是添加回调了。

Demo传送门-> 5.1 增加新功能篇Demo