如何以编程方式将iOS中的文本从右移至左

Question

我想在我的应用程序中显示一些文本，比如移动文本(从右到左用动画滚动)。如何以编程方式完成此操作？

我拿了UIViewcontroller。我正在开发AVAudioplayer。因此，在UIViewController的顶部，文本将从右向左移动。

Answer 1

首先，您在视图中取一个标签，并将其框架设置为以下所示。

 - (void)viewDidLoad
{
    [super viewDidLoad];

    la = [[UILabel alloc]initWithFrame:CGRectMake(320, 100, 200, 60)];

    la.text = @"This is my music line";

    [self.view addSubview:la];

    [NSTimer scheduledTimerWithTimeInterval:2.0
                                     target:self
                                   selector:@selector(LabelAnimation)
                                   userInfo:nil
                                    repeats:YES];

}

现在，该标签提供了如下方法在ViewDidLoad中调用的动画

-(void)LabelAnimation
{
    [UIView animateWithDuration:3.0f delay:0.0f options:UIViewAnimationOptionTransitionNone animations:^{
        la.frame = CGRectMake(-320, 100, 200, 60);
    } completion:^(BOOL finished)
     {
         la.frame = CGRectMake(320, 100, 200, 60);
     }];

}

产出低于。

​

​

Answer 2

 UILabel*label=[[UILabel alloc]init];
    label.text=@"Song Name";
    label.frame=CGRectMake(321, 20, 300, 30);
    [self.view addSubview:label];
    [UIView beginAnimations:@"" context:nil];
    [UIView setAnimationDuration:20.0];
    label.frame=CGRectMake(0, 20, 300, 30);

    [UIView commitAnimations];

或者，如果您想重复文本的滚动，可以尝试此方法。

UILabel*label=[[UILabel alloc]init];
    label.text=@"Song Name";
    label.frame=CGRectMake(321, 20, 300, 30);
    [self.view addSubview:label];
    [UIView animateWithDuration:5.0 delay:0.0 options: UIViewAnimationOptionRepeat
                     animations:^{
                         label.frame=CGRectMake(-100, 20, 300, 30);
                     }completion:^(BOOL finished){
                     }];

Answer 3

//在需要此方法的地方调用此方法。//并在此方法中编写以下4行代码

[self Message:@"test"];

- (void)Message:(NSString *)messageString
{
UILabel *label = [[UILabel alloc] initWithFrame:(CGRectMake(321, 20, 300, 30))];
label.text = messageString;
label.backgroundColor = [UIColor clearColor];
[self.view addSubview:label];
[UIView beginAnimations:@"test" context:nil];
[UIView setAnimationDuration:3];
[UIView setAnimationDidStopSelector:@selector(Message:)];
[UIView setAnimationDelegate:self];

label.frame = CGRectMake(-100, 20, 300, 30);
[UIView commitAnimations];
}

enter code here

起作用了..。