委托代理

从前有一个公司，公司的名字叫做"来福"。
Xcode->Create a new Xcode project->OS X->Application->Command Line Tool->Product Name is "LaiFu"->Create.
公司里面有一个老板。
New File->Objective-C class->Boss->Subclass of NSObject->Create.
有一天，老板想买一天电脑。
@interface Boss : NSObject
- (void)willBuyAComputer;
@end
@implementation Boss
- (void)willBuyAComputer
{
}
@end
刚刚起身忽然想起来，今天要去北京开会。于是老板决定让员工帮他买。老板起草了一份名为“买电脑委托书”的文件。
New File->Objective-C protocol->BuyComputerDelegate->Next->Create.
文件内容为“去帮我买一台电脑”。
@protocol BuyComputerDelegate<NSObject>
- (void)buyAComputer;
@end
老板把“买电脑委托书”揣在了身上。
in Boss.h
#import "BuyComputerDelegate"
in @interface
@property (assign, nonatomic) id<BuyComputerDelegate> buyComputerDelegate;
in Boss.m
- (void)willBuyAComputer
{
[self.buyComputerDelegate buyAComputer];
}
老板发现小明目前闲着没事干。
New File->Objective-C class->XiaoMing->Subclass of NSObject->Create.
老板问小明，“你有时间帮我去买个电脑么？”小明说，“why not?”
in XiaoMing.h
#import "BuyComputerDelegate"
@interface XiaoMing : NSObject <BuyComputerDelegate>
in XiaoMing.m
@implementation XiaoMing
- (void)buyComputer
{
}
@end
老板把“买电脑委托书”交给了小明说，“那你去买吧。”
in main.m
#import "Boss.h"
#import "XiaoMing.h"
@autoreleasepool{
Boss *boss = [[Boss alloc] init];
XiaoMing *xiaoMing = [[XiaoMing alloc] init];
boss.buyComputerDelegate = xiaoMing;
[boss willBuyComputer];
}
过了一会儿，小明回来了，对老板说，“我买回来了一台电脑。”
in XiaoMing.m
- (void)buyComputer
{
NSLOG(@"I has bought a computer.");
}
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