Swift - 自由调整图标按钮中的图标和文字位置(扩展UIButton)
1,Custom类型的UIButton
(2)图片与文字间的间距方式1 - 设置图片偏移量(imageEdgeInsets)
(3)图片与文字间的间距方式2 - 设置文字偏移量(titleEdgeInsets)
我们使用定制类型(Custom)的按钮就可以设置文字前面的图标。但是图片和文字的相对位置是固定的(按钮在前,文字在后)。
(1)我们用下面的左图(64*64)制作一个带图标的按钮
//创建一个图片加文字的按钮 let btn1:UIButton = UIButton(frame: CGRect(x: 50, y: 50, width: 180, height: 32)) btn1.setImage(UIImage(named: "alert"), forState: UIControlState.Normal) //按钮图标 btn1.titleLabel?.font = UIFont.boldSystemFontOfSize(28) //文字大小 btn1.setTitle("带图标按钮", forState: UIControlState.Normal) //按钮文字 btn1.setTitleColor(UIColor.orangeColor(), forState: UIControlState.Normal) //文字颜色 self.view.addSubview(btn1)
(2)图片与文字间的间距方式1 - 设置图片偏移量(imageEdgeInsets)
btn1.imageEdgeInsets = UIEdgeInsets(top: 0, left: -20, bottom: 0, right: 0)
(3)图片与文字间的间距方式2 - 设置文字偏移量(titleEdgeInsets)
btn1.titleEdgeInsets= UIEdgeInsets(top: 0, left: 20, bottom: 0, right: 0)
2,扩展UIButton
如果我们想要把文字和图片位置调换下(即文字在前、图片在后),或者文字和图片改成上下排列,那么同样通过设置 titleEdgeInsets 和 imageEdgeInsets 即可实现。
为方便快速的设置图片和文字的相对位置,以及间距,这里对UIButton进行扩展。
(1)扩展代码如下:
(2)使用样例
如果我们想要把文字和图片位置调换下(即文字在前、图片在后),或者文字和图片改成上下排列,那么同样通过设置 titleEdgeInsets 和 imageEdgeInsets 即可实现。
为方便快速的设置图片和文字的相对位置,以及间距,这里对UIButton进行扩展。
(1)扩展代码如下:
import UIKit extension UIButton { @objc func set(image anImage: UIImage?, title: String, titlePosition: UIViewContentMode, additionalSpacing: CGFloat, state: UIControlState){ self.imageView?.contentMode = .Center self.setImage(anImage, forState: state) positionLabelRespectToImage(title, position: titlePosition, spacing: additionalSpacing) self.titleLabel?.contentMode = .Center self.setTitle(title, forState: state) } private func positionLabelRespectToImage(title: String, position: UIViewContentMode, spacing: CGFloat) { let imageSize = self.imageRectForContentRect(self.frame) let titleFont = self.titleLabel?.font! let titleSize = title.sizeWithAttributes([NSFontAttributeName: titleFont!]) var titleInsets: UIEdgeInsets var imageInsets: UIEdgeInsets switch (position){ case .Top: titleInsets = UIEdgeInsets(top: -(imageSize.height + titleSize.height + spacing), left: -(imageSize.width), bottom: 0, right: 0) imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: -titleSize.width) case .Bottom: titleInsets = UIEdgeInsets(top: (imageSize.height + titleSize.height + spacing), left: -(imageSize.width), bottom: 0, right: 0) imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: -titleSize.width) case .Left: titleInsets = UIEdgeInsets(top: 0, left: -(imageSize.width * 2), bottom: 0, right: 0) imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: -(titleSize.width * 2 + spacing)) case .Right: titleInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: -spacing) imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0) default: titleInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0) imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0) } self.titleEdgeInsets = titleInsets self.imageEdgeInsets = imageInsets } }
(2)使用样例
import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let btn1:UIButton = UIButton(frame: CGRect(x: 0, y: 0, width: 200, height: 32)) btn1.center = CGPointMake(view.frame.size.width/2, 60) btn1.titleLabel?.font = UIFont.boldSystemFontOfSize(28) //文字大小 btn1.setTitleColor(UIColor.orangeColor(), forState: UIControlState.Normal) //文字颜色 btn1.set(image: UIImage(named: "alert"), title: "文字在左侧", titlePosition: .Left, additionalSpacing: 10.0, state: .Normal) view.addSubview(btn1) let btn2:UIButton = UIButton(frame: CGRect(x: 0, y: 0, width: 200, height: 32)) btn2.center = CGPointMake(view.frame.size.width/2, 120) btn2.titleLabel?.font = UIFont.boldSystemFontOfSize(28) //文字大小 btn2.setTitleColor(UIColor.orangeColor(), forState: UIControlState.Normal) //文字颜色 btn2.set(image: UIImage(named: "alert"), title: "文字在右侧", titlePosition: .Right, additionalSpacing: 10.0, state: .Normal) view.addSubview(btn2) let btn3:UIButton = UIButton(frame: CGRect(x: 0, y: 0, width: 170, height: 70)) btn3.center = CGPointMake(view.frame.size.width/2, 230) btn3.titleLabel?.font = UIFont.boldSystemFontOfSize(28) //文字大小 btn3.setTitleColor(UIColor.orangeColor(), forState: UIControlState.Normal) //文字颜色 btn3.set(image: UIImage(named: "alert"), title: "文字在上方", titlePosition: .Top, additionalSpacing: 10.0, state: .Normal) view.addSubview(btn3) let btn4:UIButton = UIButton(frame: CGRect(x: 0, y: 0, width: 170, height: 70)) btn4.center = CGPointMake(view.frame.size.width/2, 290) btn4.titleLabel?.font = UIFont.boldSystemFontOfSize(28) //文字大小 btn4.setTitleColor(UIColor.orangeColor(), forState: UIControlState.Normal) //文字颜色 btn4.set(image: UIImage(named: "alert"), title: "文字在下方", titlePosition: .Bottom, additionalSpacing: 10.0, state: .Normal) view.addSubview(btn4) } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } }
为什么我把语言切换成阿拉伯语,然后文字放下面,就是乱的
没有考虑布局方向,如果是阿拉伯语,这样就全乱了