如何从每个按钮动作中减去硬币一次

Question

我放置了三个按钮，第一个按钮允许动画显示其他按钮，但用户应该只在每个动作上花费10点。

这意味着当他们按下按钮#2时，他们只会损失10个金币(-10个金币)，行动#3也是如此。

-(IBAction)btnHint:(id)sender {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];

CGPoint center = [hints center];
center.x = 160;
center.y = 230;
[hints setCenter:center];
[UIView commitAnimations];
hintView.text = @"founded in 1996, and is a sub of telecome";
if(minusPoint) { coins = coins -10;
    //Minus a point
    minusPoint = NO;
    }
}
- (IBAction)firstHintq:(id)sender {
hintView.text = @"founded in 1996, and is a sub of telecome";
}
- (IBAction)secondHintq:(id)sender {
[_candletwo setImage:[UIImage imageNamed:@"candle2_03.png"] forState:UIControlStateNormal];
hintView.text = @"Type in text here 2";

}
- (IBAction)thirdHintq:(id)sender {
hintView.text = @"Type in the third hint here";
[_candlethree setImage:[UIImage imageNamed:@"candle2_03.png"] forState:UIControlStateNormal];
}

我如何在硬币标签上立即显示-10分?

Answer 1

设置conins为int类型的全局变量。设硬币标号为coinLabel。将3 bool设为全局变量，如btn1Pressed,btn2Pressed,btn3Pressed。在viewDidLoad中，make为btn1Pressed = btn2Pressed = btn3Pressed =false;。然后像这样做:

-(IBAction)btnHint:(id)sender {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];

CGPoint center = [hints center];
center.x = 160;
center.y = 230;
[hints setCenter:center];
[UIView commitAnimations];
hintView.text = @"founded in 1996, and is a sub of telecome";
}
- (IBAction)firstHintq:(id)sender {
hintView.text = @"founded in 1996, and is a sub of telecome";
if(!btn1Pressed) { 
    if((coins -10) >= 0){
        coins = coins -10;
        btn1Pressed = true
        coinLabel.text = [NSString stringWithFormat:@"%d",coins];
    }
    else{
        //Show an alert that the user has not enough coins
    }
}
}
- (IBAction)secondHintq:(id)sender {
[_candletwo setImage:[UIImage imageNamed:@"candle2_03.png"] forState:UIControlStateNormal];
hintView.text = @"Type in text here 2";
if(!btn2Pressed) { 
    if((coins -10) >= 0){
        coins = coins -10;
        btn2Pressed = true
        coinLabel.text = [NSString stringWithFormat:@"%d",coins];
    }
    else{
        //Show an alert that the user has not enough coins
    }
}    
}
- (IBAction)thirdHintq:(id)sender {
hintView.text = @"Type in the third hint here";
[_candlethree setImage:[UIImage imageNamed:@"candle2_03.png"] forState:UIControlStateNormal];
if(!btn3Pressed) { 
    if((coins -10) >= 0){
        coins = coins -10;
        btn3Pressed = true
        coinLabel.text = [NSString stringWithFormat:@"%d",coins];
    }
    else{
        //Show an alert that the user has not enough coins
    }
}
}

希望这对你有帮助。:)