Objective-C中一种消息处理方法performSelector: withObject:

长平狐 发布于 2013/12/25 17:17
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Objective-C中调用函数的方法是“消息传递”,这个和普通的函数调用的区别是,你可以随时对一个对象传递任何消息,而不需要在编译的时候声明这些方法。所以Objective-C可以在runtime的时候传递人和消息。

 

首先介绍两个方法 SEL和@selector

根据AppleObjective-C Runtime Reference官方文档这个传递消息的函数就是 id objc_msgSend(idtheReceiver, SEL theSelector, …)

theReceiver是接受消息的对象类型是id,theSelector是消息名称类型是SEL。下边代码我们来看看如何来生成一个SEL,如果传递消息。

首先建立一个简单的函数

- (void) fooNoInputs {

NSLog(@"Does nothing");

}

然后调用它

[self performSelector:@selector(fooNoInputs)];

第二个试验看看如何在消息中传递参数

我们建立一个有input参数的函数

- (void) fooOneIput:(NSString*) first {

NSLog(@"Logs %@", first);

}

然后调用它

[self performSelector:@selector(fooOneInput:) withObject:@"first"];

第三个试验更多的参数

- (void) fooFirstInput:(NSString*) first secondInput:(NSString*) second {

NSLog(@"Logs %@ then %@", first, second);

}

然后调用它

[self performSelector:@selector(fooFirstInput:secondInput:) withObject:@"first"withObject:@"second"];

第四个试验如何建立动态的函数,然后调用他们?我们需要建立一个selector

SEL myTestSelector = @selector(myTest:);

并且我们调用的函数在另外一个Class内

- (void)abcWithAAA: (NSNumber *)number {

int primaryKey = [number intValue];

NSLog("%i", primaryKey);

}

MethodForSelectors * mfs = [MethodForSelectors alloc];

NSArray *Arrays = [NSArray arrayWithObjects:@"AAA"@"BBB"nil];

for ( NSString *array in Arrays ){

SEL customSelector = NSSelectorFromString([NSStringstringWithFormat:@"abcWith%@:", array]);

mfs = [[MethodForSelectors allocperformSelector:customSelector withObject:0];

}

完整的代码:

@implementation ClassForSelectors
- (void) fooNoInputs {

NSLog(@"Does nothing");

}

- (void) fooOneIput:(NSString*) first {

NSLog(@"Logs %@", first);

}

- (void) fooFirstInput:(NSString*) first secondInput:(NSString*) second {

NSLog(@"Logs %@ then %@", first, second);

}

 

- (NSArray *)abcWithAAA: (NSNumber *)number {

int primaryKey = [number intValue];

NSLog("%i", primaryKey);

}

 

- (void) performMethodsViaSelectors {

[self performSelector:@selector(fooNoInputs)];

[self performSelector:@selector(fooOneInput:) withObject:@"first"];

[self performSelector:@selector(fooFirstInput:secondInput:) withObject:@"first"withObject:@"second"];

}

 

- (void) performDynamicMethodsViaSelectors {

MethodForSelectors * mfs = [MethodForSelectors alloc];

NSArray *Arrays = [NSArray arrayWithObjects:@"AAA"@"BBB"nil];

for ( NSString *array in Arrays ){

SEL customSelector = NSSelectorFromString([NSStringstringWithFormat:@"abcWith%@:", array]);

mfs = [[MethodForSelectors allocperformSelector:customSelector withObject:0];

}

}

@end

 
@implementation MethodForSelectors

- (void)abcWithAAA: (NSNumber *)number {

NSLog("%i", number);

}

@end

 
 
--EOF--
作者:Buro#79xxd出处:http://www.cnblogs.com/buro79xxd/

原文链接:http://blog.csdn.net/rhljiayou/article/details/7896583
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