ios - 将 UIImageView 添加到自定义 UIButton 类

Question

我创建了一个自定义的 UIButton 类并覆盖了 init 方法:

- (id)initWithFrame:(CGRect)frame title:(NSString *)titulo
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code

        setaDown = [UIImage imageNamed:@"setaDown"];
        separator = [UIImage imageNamed:@"separatorLine"];

        self = [UIButton buttonWithType:UIButtonTypeCustom];
        [self setFrame:frame];
        self.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
        self.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);
        seta = [[UIImageView alloc]initWithFrame:CGRectMake(frame.size.width-setaDown.size.width*2, frame.size.height/2, setaDown.size.width/1.2, setaDown.size.height/1.2)];
        [seta setImage:setaDown];
        [self addSubview:seta];
        separatorLine = [[UIImageView alloc]initWithFrame:CGRectMake(5, frame.size.height-2, frame.size.width-10, separator.size.height)];
        [separatorLine setImage:separator];
        [self addSubview:separatorLine];
        [self setTitle:titulo forState:UIControlStateNormal];
        [self setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted];
        [self setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [self setTitleColor:[UIColor blackColor] forState:UIControlStateSelected];
        self.backgroundColor = [UIColor whiteColor];
    }
    return self;
}

问题是，图像没有显示在按钮中，我有一个 exc_bad_access，在行中:

seta = [[UIImageView alloc]initWithFrame:CGRectMake(frame.size.width-setaDown.size.width*2, frame.size.height/2, setaDown.size.width/1.2, setaDown.size.height/1.2)];

不知道为什么我会收到这个错误，以及如何解决它。

Answer 1

您可以创建一个自定义的 UIControl，它有 touchUp 事件 并可以在其上放置任何类型的组件。如果 UIButton 不能满足您的需要，那么您可以制作一个自定义的 UIControl。

例如:

class MyButton: UIControl {
   @IBOutlet var myImage: UIImageView!
   @IBOutlet var myTitle: UILabel!
   @IBOutlet var myImage2: UIImageView!


   override var isSelected: Bool {
        didSet {
             // Configure image for `isSelected` status been changed.
             myImage.image = (isSelected ? selImg  : normalImg)
        }
   }       

   override var isEnabled: Bool {
        didSet {
             // Configure for `isEnabled` status been changed.
             myTitle.isEnabled = isEnabled
        }
   }
}