Swift UIButton文字与图片上下排列的三种方式

第一种方式

自定义属性文字来对UIButton的文字进行赋值得出效果

// MARK: -使用图像和文本生成上下排列的属性文本
extension NSAttributedString {
    
    class func imageTextInit(image: UIImage, imageWH: CGFloat, labelTitle: String, fontSize: CGFloat, titleColor: UIColor, labelSpacing: CGFloat) -> NSAttributedString{

        //图片文本
        let attachment = NSTextAttachment()
        attachment.image = image
        attachment.bounds = CGRectMake(0, 0, imageWH, imageWH)
        let imageText = NSAttributedString(attachment: attachment)
        
        //标题文本
        let titleDict = [NSFontAttributeName: UIFont.systemFontOfSize(fontSize), NSForegroundColorAttributeName: titleColor]
        let text = NSAttributedString(string: labelTitle, attributes: titleDict)
        
        //换行文本
        let spaceDict = [NSFontAttributeName:UIFont.systemFontOfSize(labelSpacing)]
        let lineText = NSAttributedString(string: "\n\n", attributes: spaceDict)
        
        
        //合并文字
        let mutableAttr = NSMutableAttributedString(attributedString: imageText)
        mutableAttr.appendAttributedString(lineText)
        mutableAttr.appendAttributedString(text)

        return mutableAttr.copy() as! NSAttributedString
    }

}

第二种方式

利用系统属性对UIButton进行修改得出效果

class YWButton: UIButton {

    override init(frame: CGRect) {
        super.init(frame: frame)
        
        commonInit()
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func commonInit() {
        self.titleLabel?.textAlignment = .Center
        self.imageView?.contentMode = .ScaleAspectFit
        self.titleLabel?.font = UIFont.systemFontOfSize(12)
    }
    
    override func titleRectForContentRect(contentRect: CGRect) -> CGRect {
        let titleX = 0
        let titleY = contentRect.size.height * 0.35
        let titleW = contentRect.size.width
        let titleH = contentRect.size.height - titleY
        return CGRectMake(CGFloat(titleX), titleY, titleW, titleH)
    }
    
    override func imageRectForContentRect(contentRect: CGRect) -> CGRect {
        let imageW = CGRectGetWidth(contentRect)
        let imageH = contentRect.size.height * 0.4
        return CGRectMake(0, 5, imageW, imageH)
    }



}

第三种方式

利用UIButton的文字与图片的相对位置计算得出效果

1、理论基础

1、titleEdgeInsets是titleLabel相对于其上下左右的inset，跟tableView的contentInset是类似的；
2、如果只有title，那titleLabel的 上下左右 都是 相对于Button 的；
3、如果只有image，那imageView的 上下左右 都是 相对于Button 的；
4、如果同时有image和label，那image的 上下左 是 相对于Button 的，右 是 相对于label 的；
5、label的 上下右 是 相对于Button的， 左 是 相对于label 的。

2、代码实现

//MARK: -定义button相对label的位置
enum YWButtonEdgeInsetsStyle {
    case Top
    case Left
    case Right
    case Bottom
}

extension UIButton {

    func layoutButton(style: YWButtonEdgeInsetsStyle, imageTitleSpace: CGFloat) {
        //得到imageView和titleLabel的宽高
        let imageWidth = self.imageView?.frame.size.width
        let imageHeight = self.imageView?.frame.size.height
        
        var labelWidth: CGFloat! = 0.0
        var labelHeight: CGFloat! = 0.0
        let version = NSBundle.mainBundle().infoDictionary!["CFBundleShortVersionString"] as! String
     
        if Double(version) >= 8.0 {
            labelWidth = self.titleLabel?.intrinsicContentSize().width
            labelHeight = self.titleLabel?.intrinsicContentSize().height
        }else{
            labelWidth = self.titleLabel?.frame.size.width
            labelHeight = self.titleLabel?.frame.size.height
        }
        
        //初始化imageEdgeInsets和labelEdgeInsets
        var imageEdgeInsets = UIEdgeInsetsZero
        var labelEdgeInsets = UIEdgeInsetsZero
        
        //根据style和space得到imageEdgeInsets和labelEdgeInsets的值
        switch style {
            case .Top:
                //上 左 下 右
                imageEdgeInsets = UIEdgeInsetsMake(-labelHeight-imageTitleSpace/2, 0, 0, -labelWidth)
                labelEdgeInsets = UIEdgeInsetsMake(0, -imageWidth!, -imageHeight!-imageTitleSpace/2, 0)
                break;
                
            case .Left:
                imageEdgeInsets = UIEdgeInsetsMake(0, -imageTitleSpace/2, 0, imageTitleSpace)
                labelEdgeInsets = UIEdgeInsetsMake(0, imageTitleSpace/2, 0, -imageTitleSpace/2)
                break;
                
            case .Bottom:
                imageEdgeInsets = UIEdgeInsetsMake(0, 0, -labelHeight!-imageTitleSpace/2, -labelWidth)
                labelEdgeInsets = UIEdgeInsetsMake(-imageHeight!-imageTitleSpace/2, -imageWidth!, 0, 0)
                break;
                
            case .Right:
                imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth+imageTitleSpace/2, 0, -labelWidth-imageTitleSpace/2)
                labelEdgeInsets = UIEdgeInsetsMake(0, -imageWidth!-imageTitleSpace/2, 0, imageWidth!+imageTitleSpace/2)
                break;
                
        }
        
        self.titleEdgeInsets = labelEdgeInsets
        self.imageEdgeInsets = imageEdgeInsets
        
    }