Objective-C:从addTarget中的另一个类调用一个方法:action:forControlEvents [英] Objective-C : Call a method from another class in addTarget:action:forControlEvents
问题描述
这是我的问题:
我想在UIButton上分配一个事件。我使用这种方法:
- (void)addTarget:(id)target
action:(SEL)action
forControlEvents :( UIControlEvents)controlEvents
这个:
[newsButton addTarget:self
action:@selector(myEvent2)
forControlEvents:UIControlEventTouchUpInside];
newsButton是我的UIButton。
如果myEvent2属于我所在的类,代码正在编译并执行正常,每个人都很高兴。
但是,如果我的Event2属于另一个类,我试图用这种方式改变我的代码:
MyViewController * test = [[MyViewController alloc] init];
[newsButton addTarget:self
action:@selector([test myEvent2])
forControlEvents:UIControlEventTouchUpInside];
但是我收到以下错误:
预期':'before'['token
@selector中缺少方法名称
有人有任何解决我的问题吗?
感谢提前:)
解决方案您需要将
addTarget:self
更改为addTarget:test
Here is my problem :
I want to assign an Event on an UIButton. I use this method :
- (void)addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents
like this :
[newsButton addTarget:self action:@selector(myEvent2) forControlEvents:UIControlEventTouchUpInside];
newsButton is my UIButton.
If myEvent2 belongs to the class where I am, the code is compiling and executing fine, everybody is happy.
But if myEvent2 belongs to another class I don't succeed to execute it (the project compiles fine).
I tried out to change my code in that way :
MyViewController* test = [[MyViewController alloc] init]; [newsButton addTarget:self action:@selector([test myEvent2]) forControlEvents:UIControlEventTouchUpInside];
but I get the followings errors :
Expected ':' before '[' token
Method name missing in @selector
Does someone have any solution to my problem ?
Thanks by advance :)
解决方案You need to change
addTarget:self
toaddTarget:test
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