单击时如何更改UIButton的标题颜色？

Question

我有一个视图，我以编程方式创建了8个按钮。按钮的标题颜色为白色。我想在点击时将按钮标题的颜色更改为绿色。如果我点击任何其他按钮，之前点击的按钮标题颜色应该变为白色，当前按钮标题颜色应该变为绿色。

怎么做？

Answer 1

像这样初始化所有按钮

[mybutton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[mybutton setTitleColor:[UIColor greenColor] forState:UIControlStateSelected];
[mybutton addTarget:self action:@selector(onclick:) forControlEvents:UIControlEventTouchUpInside];

然后在单击时更改按钮的选定状态

-(void)onclick:(id)sender{
UIButton *button = (UIButton *)sender;
button.selected = !button.selected;
}

Answer 2

为所有按钮创建IBAction，创建属性@property (strong, nonatomic) UIButton *currentButton。在操作中执行以下操作：

-(IBAction)buttonClicked:(id)sender
{
    UIButton *buttonSender = (UIButton *)sender;

    [self.currentButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    self.currentButton = buttonSender;
    [self.currentButton setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
}

Answer 3

设置按钮的控制状态：

[btnOk setTitleColor:[UIColor yellowColor] forState:UIControlStateSelected];
[btnOk setTitleColor:[UIColor yellowColor] forState:UIControlStateHighlighted];
[btnOk setTitleColor:[UIColor yellowColor] forState:UIControlStateNormal];