如何在 obj c 中对具有一些文本的 uilabel 视图进行动画处理
在我的应用程序中，我计划为 textLabels 添加动画，它应该来自屏幕的左侧，
我使用了以下代码，但它崩溃了
(void)animateLoop {
UILabel *mylab;
mylab.text=@"SAAAAdiiiii";
mylab.frame = CGRectMake(-mylab.bounds.size.width, 100, mylab.bounds.size.width, mylab.bounds.size.height);
[UIView beginAnimations:@"timesquare" context:nil];
[UIView setAnimationDuration:5];
[UIView setAnimationRepeatAutoreverses:(YES)];
[UIView setAnimationRepeatCount:10];
mylab.frame = CGRectMake(480, 100, mylab.bounds.size.width, mylab.bounds.size.height);
[UIView commitAnimations];
}
，我在 viewDidload 中调用了它
，但它在这一行崩溃了 mylab.text=@" SAAAAdiiii”； crashLog:invalidargument
谁能告诉我如何
提前为uilabel 设置动画
in my app i am planing to add the animation for the textLabels, which should come from left side of the screen
i have used following code but its crashing
(void)animateLoop {
UILabel *mylab;
mylab.text=@"SAAAAdiiiii";
mylab.frame = CGRectMake(-mylab.bounds.size.width, 100, mylab.bounds.size.width, mylab.bounds.size.height);
[UIView beginAnimations:@"timesquare" context:nil];
[UIView setAnimationDuration:5];
[UIView setAnimationRepeatAutoreverses:(YES)];
[UIView setAnimationRepeatCount:10];
mylab.frame = CGRectMake(480, 100, mylab.bounds.size.width, mylab.bounds.size.height);
[UIView commitAnimations];
}
n i called this in the viewDidload
but it was crashing at this line mylab.text=@"SAAAAdiiiii"; crashLog:invalidargument
can any one tell me how can i animate the uilabel
thanx in advance
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您需要分配 UILabel 。意味着首先为您的标签创建内存...
建议您将
UILabel *mylab;作为iVar，因为它必须释放。You need to alloced the UILabel . means first create the memory for you label ...
Suggest you to have
UILabel *mylab;asiVar, because it has to bereleased.您必须首先分配并初始化您的 UILabel..
而不是
UILabel *mylab;尝试UILabel *mylab = [[UILabel alloc] init];您还必须在某个地方释放它，并且必须将标签添加到您的视图中（类似于
[self.view addSubview:mylab];）。You have to allocate and init your UILabel first..
instead of
UILabel *mylab;tryUILabel *mylab = [[UILabel alloc] init];You also have to release it somewhere and you have to add the label to your view (something like
[self.view addSubview:mylab];).