ios - UIButton 滑入，而不是淡入

Question

我在 UIViewController 中有一个 UIButton，我目前在应用程序打开时“淡入”以查看它。 不过，我想让 UIButton 从左向右滑入。

我不知道如何让它从左向右滑入，我的尝试都失败了，尽管我已经把“淡入”的东西固定下来了。

你能给我什么帮助吗？谢谢!我可以根据需要添加更多代码-

ViewController.h

@property (weak, nonatomic) IBOutlet UIButton *buttonOne;

ViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
        NSTimer *timermovebutton = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(movebutton) userInfo:nil repeats:NO];
    [timermovebutton fire];
}

-(void) movebuttontwo
{
    buttonTwo.alpha = 0;
    [UIView beginAnimations:Nil context:Nil];
    [UIView setAnimationDelay:0.5];
    [UIView setAnimationCurve:UIViewAnimationTransitionCurlUp];

    [UIView setAnimationDelegate:self];
    [UIView setAnimationDuration:1.0];
    buttonTwo.alpha = 1.0;

    [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];
    [UIView commitAnimations];
}

Answer 1

您需要为按钮框架设置动画，而不是使用动画曲线。

从 iOS 4 开始，我们就有了 UIView 动画 block :

// first set the UIButton frame to be outside of your view:
// we are only concerned about it's location on the X-axis so let's keep all properties the same
[buttonTwo setFrame:CGRectMake(CGRectGetMaxX(self.view.frame), CGRectGetMinY(buttonTwo.frame), CGRectGetWidth(buttonTwo.frame), CGRectGetHeight(buttonTwo.frame))];
[UIView animateWithDuration:0.5
                      delay:0
                    options:UIViewAnimationCurveEaseOut
                 animations:^{
                     // set the new frame
                     [buttonTwo setFrame:CGRectMake(0, CGRectGetMinY(buttonTwo.frame), CGRectGetWidth(buttonTwo.frame), CGRectGetHeight(buttonTwo.frame))];
                 } 
                 completion:^(BOOL finished){
                     NSLog(@"Done!");
                 }
];

有一个 good tutorial over at Ray Wenderlich您可以查看以了解更多信息。