自定义UIButton不会更改其图像

我创建了一个自定义的UIButton，并且它有一个“selected”字段来标识这个按钮是否被选中。 默认情况下：它将图像设置为image1。 当它被选中时，它会更改为image2。

@interface MyButton: UIButton

@property (getter=isSelected, setter=setSelected:) BOOL selected;

@end

@implementation MyButton

@synthesize selected = _selected;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.selected = NO;
    }
    return self;
}

-(void) setSelected:(BOOL)selected
{
    if (selected)
    {
        [self setImage:[UIImage imageNamed:@"image1"] forState:UIControlStateNormal];        
    }
    else
    {
        [self setImage:[UIImage imageNamed:@"image2"] forState:UIControlStateNormal];        
    }

    _selected = selected;
}

-(BOOL) isSelected
{
    return _selected;
}

现在，从一个UIViewController，我将这个自定义按钮添加到它的视图。 当用户点击另一个按钮时，我希望我的自定义按钮应该改变其图像（从image1 - > image2，反之亦然）。

@interface SessionViewController (){    
    MyButton* btn;
}

@end

@implementation ViewController

- (void) viewDidLoad
{
    [super viewDidLoad];
    btn = [[MyButton alloc] initWithFrame: CGRectMake(0,0,100,100)];
}

- (IBAction) touchChangeStateButton
{
    BOOL b = btn.isSelected;
    btn.selected = !b; 
}

@end

我的问题是为什么我的自定义按钮不改变它的图像？ 谢谢。

---

我认为问题在于UIButton的内置选定属性会干扰您的自定义属性。 我尝试将名称更改为'selacted'（只是为了使它不同），并更改了所有相应的代码，如下所示，并且它看起来像您期望的那样工作。

@interface MyButton : UIButton

@property (getter=isSelacted, setter=setSelacted:) BOOL selacted;

@end

@implementation MyButton

@synthesize selacted = _selacted;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.selacted = NO;
    }
    return self;
}

-(void) setSelacted:(BOOL)selacted
{
    if (selacted)
    {
        [self setImage:[UIImage imageNamed:@"image1"] forState:UIControlStateNormal];
    }
    else
    {
        [self setImage:[UIImage imageNamed:@"image2"] forState:UIControlStateNormal];
    }

    _selacted = selacted;
}

-(BOOL) isSelacted
{
    return _selacted;
}

然后在你的viewController中：

- (IBAction) touchChangeStateButton
{
    BOOL b = btn.isSelacted;
    btn.selacted = !b;
}

---

改变这个：

if (selected)
    {
        [self setImage:[UIImage imageNamed:@"image1"] forState:UIControlStateNormal];        
    }
    else
    {
        [self setImage:[UIImage imageNamed:@"image2"] forState:UIControlStateNormal];        
    }

有了这个：

    if (selected)
        {
// set image for selected state
            [self setBackgroundImage:[UIImage imageNamed:@"image1"] forState:UIControlStateSelected];        
        }
        else
        {
// set image for normal state
            [self setBackgroundImage:[UIImage imageNamed:@"image2"] forState:UIControlStateNormal];        
        }

或者你可以简单地从init方法中定义两个图像

[self setBackgroundImage:[UIImage imageNamed:@"image2"] forState:UIControlStateSelected];
[self setBackgroundImage:[UIImage imageNamed:@"image1"] forState:UIControlStateNormal];

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