更新UILabel在xCode iOS8中重置我的视图

Question

每当我的文本在我的游戏中改变（UILabel）时，它会将我运行（man）的人的UIImageView重置为起始位置（屏幕左侧）。

它在某种意义上几乎充当了视图控制器重置...不知道为什么。 所有的整数和变量都可以通过定时器更新，但只要我尝试更改实际文本，就会重置为起始位置。

这里是我的NSTimer更新标签：

-(void)updateLabels{ 
//update lightning strikes label 
strikesLeftDisplay=@"Strikes Left: "; 
strikesLeftDisplay=[strikesLeftDisplay stringByAppendingString:[NSString stringWithFormat: @"%d", strikesLeft]]; 
lblLeft.text=strikesLeftDisplay; 
} 

这里是我的onDidLoad：

- (void)viewDidLoad { 
currentScreenX=self.view.frame.size.width; 
currentScreenY=self.view.frame.size.height; 

currentLevel=1; 
runningSpeed=7; 
lightningSpeed=0.023; 
runnerImageNumber=0; 
strikesLeft=3; 

cloudImage.hidden=YES; 
boltImage.hidden=YES; 

runningMovement=[NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(startRunning) userInfo:nil repeats:YES]; 

labelScanner=[NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(updateLabels) userInfo:nil repeats:YES]; 



[super viewDidLoad]; 

} 

最后，这里是我的startRunning方法：

- (void)startRunning{ 
if(livesLeft==0){[self endGame];} 

manX=man.frame.origin.x; 
manY=man.frame.origin.y; 

if([direction isEqualToString:@"left"] && touchX < (manX+20)){ 
    man.center=CGPointMake(man.center.x - runningSpeed,man.center.y); 
}else if([direction isEqualToString:@"right"] && touchX > (manX+22)){ 
    man.center=CGPointMake(man.center.x + runningSpeed,man.center.y); 
} 
else{ 
    direction=@"0"; 
} 




//animate runner 
if ([direction isEqualToString:@"right"]){ 
    if(runnerImageNumber==1){UIImage *image=[UIImage imageNamed:@"run1.png"];[man setImage:image];} 
    if(runnerImageNumber==2){UIImage *image=[UIImage imageNamed:@"run2.png"];[man setImage:image];} 
    if(runnerImageNumber==3){UIImage *image=[UIImage imageNamed:@"run3.png"];[man setImage:image];} 
    if(runnerImageNumber==4){UIImage *image=[UIImage imageNamed:@"run4.png"];[man setImage:image];} 
    if(runnerImageNumber==5){UIImage *image=[UIImage imageNamed:@"run5.png"];[man setImage:image];} 
    if(runnerImageNumber==6){UIImage *image=[UIImage imageNamed:@"run6.png"];[man setImage:image];} 
    if(runnerImageNumber==7){UIImage *image=[UIImage imageNamed:@"run7.png"];[man setImage:image];} 
    if(runnerImageNumber==8){UIImage *image=[UIImage imageNamed:@"run8.png"];[man setImage:image];} 
    if(runnerImageNumber==9){UIImage *image=[UIImage imageNamed:@"run9.png"];[man setImage:image];} 
    runnerImageNumber++; 
    if(runnerImageNumber==9){runnerImageNumber=1;} 
} 
if ([direction isEqualToString:@"left"]){ 
    if(runnerImageNumber==1){UIImage *image=[UIImage imageNamed:@"run10.png"];[man setImage:image];} 
    if(runnerImageNumber==2){UIImage *image=[UIImage imageNamed:@"run11.png"];[man setImage:image];} 
    if(runnerImageNumber==3){UIImage *image=[UIImage imageNamed:@"run12.png"];[man setImage:image];} 
    if(runnerImageNumber==4){UIImage *image=[UIImage imageNamed:@"run13.png"];[man setImage:image];} 
    if(runnerImageNumber==5){UIImage *image=[UIImage imageNamed:@"run14.png"];[man setImage:image];} 
    if(runnerImageNumber==6){UIImage *image=[UIImage imageNamed:@"run15.png"];[man setImage:image];} 
    if(runnerImageNumber==7){UIImage *image=[UIImage imageNamed:@"run16.png"];[man setImage:image];} 
    if(runnerImageNumber==8){UIImage *image=[UIImage imageNamed:@"run17.png"];[man setImage:image];} 
    if(runnerImageNumber==9){UIImage *image=[UIImage imageNamed:@"run18.png"];[man setImage:image];} 
    runnerImageNumber++; 
    if(runnerImageNumber==9){runnerImageNumber=1;} 
} 






} 

Answer 1

通常你看到这种类型的东西，因为你直接设置视图的框架（或中心或bounds.size），但你的应用程序我们es自动布局。

当您更改标签的文本时，标签将自身标记为需要布局。这会使自动布局运行，并根据它们的约束来设置视图的框架，并撤销对这些视图的框架直接进行的任何更改。

而不是直接设置man.center，您需要修改控制man的X位置的约束的常量。如果您在xib或storyboard中创建约束，则可以将约束连接到插座（可能位于视图控制器中）以访问它。

你可能会更好地切换到SpriteKit为您的游戏。

Answer 2

我有同样的问题。确保在Interface Builder文档中使用自动布局复选标记为UNCHECKED！这为我解决了这个问题。希望这可以帮助。