Xcode - 如何获取多次更改标签文本的按钮 [英] Xcode - How to get button to change label text multiple times

问题描述

我试图通过按一个按钮让数字按不同的数量变化。我是xcode的新手，不知道怎么做，任何帮助都会很好。

I am trying to have numbers change by different amounts, by the press of one button. I am new to xcode and do not know how to do this, any help would be nice.

我希望这个数字改为15，但只有当我按下按钮第二次。然后，在第三次按下时，我想要更改数字30.
按1：从0到5，
按2：从5到15，
按3：从15到30，我想学习如何添加不同金额

I want the number to change to 15, but only when I press the button for a second time. Then, I would like, upon a third press, for the number to change 30. press 1: from "0" to "5", press 2: from "5" to "15", press 3: from "15" to 30", I want to learn how to add different amounts

-(IBAction)changep1:(id) sender {
p1score.text = @"5";
if (p1score.text = @"5"){

p1score.text = @"15";

//即使以上工作，我也不知道怎么写将其更改为30的代码。}

//Even if the above worked, I do not know how I would write the code to change it to 30. }

推荐答案

听起来您可能想要在视图控制器中添加一个属性来存储玩家1的得分，如下所示：

It sounds like you probably want to add a property to your view controller to store Player 1's score, something like this:

@property (nonatomic, assign) NSInteger p1Score;

然后在 init 方法中，您可以为此属性赋予初始值：

Then in your init method, you can give this property an initial value:

self.p1Score = 0; // you can set this to any integral value you want

然后，在你的按钮点击方法（ changep1 ）你可以这样做：

Then, in your button tap method (changep1) you can do something like this:

- (IBAction)changep1:(id)sender
{
    // add 5 (or any value you want) to p1Score
    self.p1Score = self.p1Score + 5;

    // update the display text. in code below %d is replaced with the value of self.p1Score
    p1score.text = [NSString stringWithFormat:@"%d", self.p1Score];
}

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