Question

我创建了一个自定义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，图片没有显示在按钮中，我在行中有exc_bad_access：

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)];

不知道为什么我会得到这个错误，以及如何解决它。

Answer 1

您可以创建自定义UIControl，它有touchUp event并在其上放置任何类型的组件。如果UIButton无法满足您的需求，那么您可以自定义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
        }
   }
}

Answer 2

UIButton已有imageView。你可以简单地使用

self.imageView.image = setaDown

并根据需要配置imageView的其他方面（例如，位置和大小，以便separator适合）。

Answer 3

据我所知，您无法在按钮上添加2张图像。获取图像编辑器，将它们组合在一起然后执行此操作：

[self setBackgroundImage:[UIImage imageNamed:@"mynewimagename"] forState:UIControlStateNormal]

更简单。

将UIImageView添加到自定义UIButton类

3 个答案: