Question

嘿我正在开发一个小应用程序，它根据日期选择器的当前状态更改UIButton的文本。它要么显示＆＃34;那是什么日子？＆＃34;或＆＃34;它会是哪一天？＆＃34;。但是对于xcode 6.3 beta，UIButton SetTitle方法似乎不存在。相反，我尝试将一个字符串分配给titleLabel.txt，但这不会更改按钮文本。

方法如下：

(IBAction) changeButton:(id)sender {
NSDate *currentDate = [self.datePicker date];
NSDate *now =  [NSDate date];

if(currentDate<now){
    self.whatButton.titleLabel.text = @"What day was it?";
}
else {
    self.whatButton.titleLabel.text = @"What day will it be?";
}

我已经看到setTitle方法是一种可能的解决方案，但发现库可能已被更改。任何建议将不胜感激！

Answer 1

您应该像这样设置标题：

[self.whatButton setTitle:@"What day was it?" forState:UIControlStateNormal];

Answer 2

使用以下代码将按钮的标题设置为不同的状态，就像正常

一样

 [self.yourButton setTitle:@"Default Title" forState:UIControlStateNormal];

好像你已经点击按钮选择状态，它必须是

[self.yourButton setTitle:@"Selected Title" forState:UIControlStateSelected];

好像您再次点击了按钮以取消选择状态，它必须是

[self.yourButton setTitle:@"Selected Title" forState:UIControlStateDisable];

以及许多其他状态，您可以在按钮的每个状态中设置不同的文本

Answer 3

尝试更改日期比较的方式 -

-(IBAction)changeButton:(id)sender {

NSDate *currentDate = [self.datePicker date];
NSDate *now =  [NSDate date];

NSString *titleString = ([currentDate timeIntervalSinceReferenceDate] < [now timeIntervalSinceReferenceDate]) ? @"What day was it?" : @"What day will it be?";
[self.whatButton setTitle:titleString forState:UIControlStateNormal];
}

Answer 4

谢谢你的所有建议。第一个建议是有点偏离基础，因为它不是我想改变的发送者头衔。第二个建议是我将来会使用的好主意。我最终用这个解决了这个谜语：

- (IBAction) changeButton:(id)sender {
    NSDate *currentDate = [self.datePicker date];
    NSDate *now =  [NSDate date];
    UIButton *tempBtn = (UIButton *)self.whatButton;
    UIControlState state = tempBtn.state;
    if([currentDate compare:now] == NSOrderedAscending){
        [tempBtn setTitle:@"What day was it?" forState:state];
    }
    else {
        [tempBtn setTitle:@"What day will it be?" forState:state];
    }

}`

以编程方式更改UIButton的标题在iOS Xcode-Beta 3中不起作用

4 个答案: