Question

我知道如何设置enable = YES / NO，一个使用属性和xib创建的按钮。但是，如何对同一类中另一个方法的编程创建按钮执行相同的操作？

例如，这是viewDidLoad中的我的按钮：

UIButton *AllList = [UIButton buttonWithType:UIButtonTypeCustom];
AllList.frame = CGRectMake(40, 80, 107.f, 53.5f); //set frame for button

UIImage *buttonImageFull = [UIImage imageNamed:@"allModsBtn.png"];
[AllList setBackgroundImage:buttonImageFull forState:UIControlStateNormal];
[self.view addSubview:AllList];

// add targets and actions
[AllList addTarget:self action:@selector(getButtons:) forControlEvents:UIControlEventTouchUpInside];    
AllList.tag = 0;

我想在另一种方法中将此按钮的启用设置为YES或NO。

Answer 1

@implementation {
     UIButton *myButton;
}

- (void)viewDidLoad {
    myButton = [UIButton buttonWithType:UIButtonTypeCustom];
    myButton.tag = 121;
    myButton.frame = CGRectMake(40, 80, 107.f, 53.5f); //set frame for button

    UIImage *buttonImageFull = [UIImage imageNamed:@"allModsBtn.png"];
    [myButton setBackgroundImage:buttonImageFull forState:UIControlStateNormal];
    [self.view addSubview:myButton];

   // add targets and actions
   [myButton addTarget:self action:@selector(getButtons:)       
   forControlEvents:UIControlEventTouchUpInside];    
   myButton.tag = 0;
}

- (void)someOtherMethod {

   myButton.enabled = YES;

OR

  //In this case you dont need to define uibutton to globaly

   UIButton *button = (UIButton*)[[self view] viewWithTag:121];
   [button setEnabled:YES];

}

Answer 2

您必须将该按钮设为视图控制器的ivar。

@implementation {
    UIButton *myButton;
}

- (void)viewDidLoad {
    myButton = [UIButton buttonWithType:UIButtonTypeCustom];
    myButton.frame = CGRectMake(40, 80, 107.f, 53.5f); //set frame for button

    UIImage *buttonImageFull = [UIImage imageNamed:@"allModsBtn.png"];
    [myButton setBackgroundImage:buttonImageFull forState:UIControlStateNormal];
    [self.view addSubview:myButton];

    // add targets and actions
    [myButton addTarget:self action:@selector(getButtons:)       
       forControlEvents:UIControlEventTouchUpInside];    
    myButton.tag = 0;
}

- (void)someOtherMethod {
    myButton.enabled = YES;
}

Answer 3

这样的事情：

UIButton *myButton = [self.view viewWithTag:BUTTON_TAG]; // in your case is 0
[myButton setEnabled:YES];

Answer 4

两种方法：

1）你可以把它变成ivar然后

AllList.enabled = YES;

或

[AllList setEnabled:YES];

2）为按钮设置唯一标签

UIButton *AllList = [UIButton buttonWithType:UIButtonTypeCustom];
AllList.frame = CGRectMake(40, 80, 107.f, 53.5f); //set frame for button
AllList.tag = kUNIQUE_TAG;

在你要弄乱按钮的启用属性

的方法中

UIButton *theButton = (UIButton *)[self viewWithTag:kUNIQUE_TAG];
[theButton setEnabled:YES];

在Xcode中启用了以编程方式创建的按钮

4 个答案: