在ios相机叠加层UIPickercontroller中更改标签的文本 [英] Change text of label in ios camera overlay UIPickercontroller

问题描述

我正在尝试通过计时器以其他方法更改我在UIImagePickerviewController上的UIView覆盖层中以编程方式创建的标签文本，但是当然，当我尝试以这种方式更改文本时

I'm trying to change though a timer in a different method the text of a label I created programmatically in a UIView overlay that goes on a UIImagePickerviewController, but of course when I try to change the text in this way

labelname.text = @"TEST";

labelname.text = @"TEST";

我收到错误消息使用未声明的标识符labelname"

I get the error "use of undeclared identifier labelname"

如何引用该特定标签?我应该在每次计时器计时时创建一个新标签吗?

How can I refer to that specific label? Should I create a new label each time the timer ticks?

我试图在.h文件中声明它，但是我想我只是在创建一个不同的标签...有什么想法吗?

I tried to declare it in the .h file, but I'm guessing i'm just creating a different label...any ideas?

推荐答案

只需将标签整体传递给Timer函数:

Just Pass the Label As a whole to the Timer Function:

说您的标签是在ViewDidLoad中定义的，就像这样:

Say Your Label is defined in ViewDidLoad like this :

- (void)viewDidLoad 
{
     //Do Something here
     UILabel  * label = [[UILabel alloc] 
     initWithFrame:CGRectMake(xcoordinateLabel, ycoordinateLabel, width, height)];
     label.backgroundColor = [UIColor clearColor];
     label.textAlignment = UITextAlignmentCenter;
     label.textColor=[UIColor whiteColor];
     label.text = @"TEST";
     [self.view addSubview:label];
     [self changeLabelText:label];
 }

其中的changeLabelText定义如下:

Where your changeLabelText is defined as this with some delay:

- (void) changeLabelText:(UILabel *)label
{
    //Changing Values after 10s Delay
    double delayInSeconds = 10.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 
    (int64_t)(delayInSeconds * NSEC_PER_SEC));

    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    label.text = @"TESTING Change";
    });
}

您的Timer函数可以替换changeLabelText

Your Timer function can replace changeLabelText

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