如何動畫更改按鈕標題？

Question

我想要動畫更改按鈕標題。例如，按鈕的標題是「one」，點擊該按鈕後，淡出「one」，然後淡入「NewTitle」。

Answer 1

比具有重複的觀點玩弄相反，簡單的淡入淡出轉變可以與CATransition類製成。

// CATransition defaults to fade 
CATransition *fade = [CATransition animation]; 
// fade.duration = ... 
[button.layer addAnimation:fade]; 

[button setTitle:@"New title" forControlState:UIControlStateNormal]; 

該按鈕將淡入其新狀態。這適用於標籤，整個視圖層次結構，無論如何。

Answer 2

所以創建兩個按鈕是不是一個好主意，所以我創建了一個簡單的項目來測試代碼，你的問題，這裏是我想出

viewcontroller.h

#import <UIKit/UIKit.h> 

    @interface ViewController : UIViewController{ 

     IBOutlet UIButton *myButton; 
    } 


    @property(nonatomic,strong) IBOutlet UIButton *myButton; 

    -(IBAction)animateFadeOutButtonTitle:(id)sender; 
    -(void)animateFadeInButtonTitle; 


    @end 

視圖 - 控制。米

#import "ViewController.h" 

@interface ViewController() 

@end 

@implementation ViewController 

@synthesize myButton=_myButton; 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
    [_myButton setTitle:@"One" forState:UIControlStateNormal]; 



} 

-(IBAction)animateFadeOutButtonTitle:(id)sender 
{ 
    [UIView animateWithDuration:0.25 animations:^{_myButton.titleLabel.alpha = 0.0;}]; 

    [self performSelector:@selector(animateFadeInButtonTitle) withObject:self afterDelay:1.0]; 
} 

-(void)animateFadeInButtonTitle; 
{ 

    [_myButton setTitle:@"New Title" forState:UIControlStateNormal]; 
    [UIView animateWithDuration:2.0 
          delay:0.0 
         options: UIViewAnimationCurveEaseInOut 
        animations:^{_myButton.titleLabel.alpha = 1.0;} 
        completion:nil]; 

} 


- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 



} 

@end