xcode 是否可以更改 UIButton 的操作？
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Is it Possible to Change Action For UIButton?
提问by Musthafa P P
I am trying to change Action For the UIButton in ios applicatio. I did Following Code
我正在尝试更改 ios 应用程序中 UIButton 的操作。我做了以下代码
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:@selector(aMethodShow:) forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[view addSubview:button];
In particular Section I want to change Action for this Button .So i did this
特别是部分我想更改此按钮的操作。所以我这样做了
[button addTarget:self action:@selector(aMethodHide:) forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Hide View" forState:UIControlStateNormal];
Unfortunately This code note Working?
不幸的是这个代码说明工作？
回答by Kumaran
I suggest before adding new target, first invoke removeTargeton UIbuttonobject then add new target with other action.
我建议增加新的目标之前，首先调用removeTarget的UIbutton对象，然后添加新的目标与其他行动。
回答by Atanu Mondal
I think it will help you
我想它会帮助你
[yourButton removeTarget:nil
action:NULL
forControlEvents:UIControlEventAllEvents];
[yourButton addTarget:self
action:@selector(yourAction:)
forControlEvents:UIControlEventTouchUpInside];
回答by KAREEM MAHAMMED
You can use same action target instead of using two target. In one target you have to differentiate like below
您可以使用相同的动作目标而不是使用两个目标。在一个目标中，您必须区分如下
-(void)btnAction
{
if(target1)
{
// code for target 1
}
else
{
// code for target 2
}
}
Here target1 is BOOLvalue which value first set to be YES. And change its value NOwhenever you want to perform target 2 code.
这里的 target1 是BOOL值首先设置为 的值YES。并NO在您想要执行目标 2 代码时更改其值。
I hope this will helps You.
我希望这会帮助你。
回答by mauricioconde
I made an app recently and i had the same situation, but i found another way to solve it so i decided to share my solution with people who may be in the same situation.
我最近做了一个应用程序，我遇到了同样的情况，但我找到了另一种解决方法，所以我决定与可能处于相同情况的人分享我的解决方案。
I'll try to explain what i did with the context of this question:
我将尝试解释我在这个问题的上下文中做了什么：
I added a tag to the
buttonand i associated it with one of the functions thatbuttonneeds to call (aMethodShow:for example).buttonalways call the same function (callSpecificFunc:for example). WhatcallSpecificFunc:does is call either functionaMethodShow:oraMethodHideaccording with the currentbuttontag.In the particular section in which the
buttonneeds to call a different function, i only change the tag ofbutton.
我向 中添加了一个标签，
button并将其与button需要调用的函数之一相关联（aMethodShow:例如）。button总是调用相同的函数（callSpecificFunc:例如）。什么callSpecificFunc:是调用函数aMethodShow:或aMethodHide根据当前button标签调用。在
button需要调用不同函数的特定部分中，我只更改了button.
Something like this:
像这样的东西：
NSInteger tagOne = 1000; //tag associated with 'aMethodShow' func
NSInteger tagTwo = 1001; //tag associated with 'aMethodHide' func
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:@selector(callSpecificFunc:) forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[view addSubview:button];
...
// in some part of code, if we want to call 'aMethodShow' function,
// we set the button's tag like this
button.tag = tagOne
...
//Now, if we want to call 'aMethodHide', just change the button's tag
button.tag = tagTwo
...
-(void) callSpecificFunc:(UIButton*)sender
{
NSInteger tagOne = 1000;
NSInteger tagTwo = 1001;
if([sender tag] == tagOne){
//do whatever 'aMethodShow' does
}else {
//do whatever 'aMethodHide' does
}
}
Of course it could be applied for more than 2 functions :)
当然它可以应用于两个以上的功能:)
