如何更改iOS按鈕的圖像和文本？

Question

我有一個正確交換圖像的Round Rect按鈕。我也想改變它們中的文字，但是文字沒有出現。 StackOverflow上的大多數問題似乎都涉及到一個問題，而不是另一個問題，而那些看起來最相關的問題最終會成爲某種類型的BarItem。

從按鈕觸摸的IBAction中，我有以下幾點。

[sender setImage:[UIImage imageNamed:@"swappingCorrectly.png"] forState:UIControlStateNormal]; 
[sender setTitle:(@"Aww, this doesn't show up!") forState:UIControlStateNormal]; 

如上所述，圖像切換正常 - 但該標籤沒有顯示出來。我在另一個不交換圖像的按鈕中使用相同的文本交換線，它工作正常。

它只是在第一次點擊後不顯示。任何人都知道我能做些什麼來使文字顯示出來？

Answer 1

這適用於我。

- (IBAction)buttonPressed:(id)sender { 
    [sender setImage:[UIImage imageNamed:@"button.jpeg"] forState:UIControlStateNormal]; 
    [sender setTitle:(@"Aww") forState:UIControlStateNormal]; 
} 

我也注意到，該標籤是最右邊，而不是死點。標籤是否可能出現在錯誤的地方？註釋掉setTitle會產生相同的結果，按鈕標題被圖像偏移。

如何將UIImageView轉換爲按鈕。注意：這是非常骯髒的，應該包裝成一個班。我離開了，但註釋掉了代碼，只需點擊一下即可。沒有顯示的是UIImageView在xib文件上拋出並設置爲userenabled = true。

#import "ViewController.h" 

@interface ViewController() 

@end 

@implementation ViewController 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
    UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(buttonPressed:)]; 
    [[self fakeButton] addGestureRecognizer:tap]; 

    UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 250, 25)]; 
    label.text = @"unpressed"; 
    label.backgroundColor = [UIColor clearColor]; 
    [[self fakeButton] addSubview:label]; 
} 

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

- (void)buttonPressed:(id)sender { 
// UIGestureRecognizer *gesture = (UIGestureRecognizer*)sender; 
// UIImageView* temp = (UIImageView*)gesture.view; 
// for (UILabel *label in temp.subviews) { 
//  label.text = @"pressed"; 
// } 
// temp.image = [UIImage imageNamed:@"button.jpeg"]; 
//  
// //if you want it to reset after a Delay 
// [self performSelector:@selector(buttonUnpressed:) withObject:temp afterDelay:.2]; 

} 

-(void)buttonUnpressed:(UIImageView*)view 
{ 

// for (UILabel *label in view.subviews) { 
//  label.text = @"unpressed"; 
// } 
// view.image = [UIImage imageNamed:@"origButton.jpeg"]; 
// [self performSelector:@selector(buttonUnpressed:) withObject:view afterDelay:.2]; 
} 

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *touch = [touches anyObject]; 

    CGPoint point = [touch locationInView:self.view]; 

    if (CGRectContainsPoint([[self fakeButton] frame], point)) 
    { 
      //Do touch down state 
     NSLog(@"touchStarted"); 
     [[self fakeButton] setImage:[UIImage imageNamed:@"button.jpeg"]]; 
     for (UILabel *label in [[self fakeButton] subviews]) { 
      label.text = @"pressed"; 
     } 
    } 

} 
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    NSLog(@"touch ended"); 
    //remove touch down state 
    [[self fakeButton] setImage:[UIImage imageNamed:@"origButton.jpeg"]]; 
    for (UILabel *label in [[self fakeButton] subviews]) { 
     label.text = @"unpressed"; 
    } 

} 

@end