ios开发框架封装(九)：UIButton拓展、UIImage拓展、UITextField拓展、视频压缩

先放demo地址：github.com/KeWangKW/99…

（一）UIButton拓展【修改图文排列】

• 代码文件： UIButtonExt
• 示例文件： UIButtonExtShow

import UIKit
public extension UIButton {
    @objc enum Position:NSInteger {
        case top, left, bottom, right
    }
    //MARK: 文字图片布局
    /// 文字图片布局
    @objc func kw_set(image position: Position, spacing: CGFloat) {
        self.layoutIfNeeded()
        guard
            let imageWidth = self.imageView?.frame.width,
            let imageHeight = self.imageView?.frame.height,
            let labelWidth = self.titleLabel?.frame.width,
            let labelHeight = self.titleLabel?.frame.height
        else { return }
        let space = spacing
        var imageInsets = UIEdgeInsets.zero
        var labelInsets = UIEdgeInsets.zero
        switch position {
        case .top:
            imageInsets = UIEdgeInsets(top: -labelHeight - space/2.0, left: 0, bottom: 0, right: -labelWidth)
            labelInsets = UIEdgeInsets(top: 0, left: -imageWidth, bottom: -imageHeight - space/2.0, right: 0)
            break
        case .left:
            imageInsets = UIEdgeInsets(top: 0, left: -space/2.0, bottom: 0, right: space/2.0)
            labelInsets = UIEdgeInsets(top: 0, left: space/2.0, bottom: 0, right: -space/2.0)
            break
        case .bottom:
            imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: -labelHeight - space/2.0, right: -labelWidth)
            labelInsets = UIEdgeInsets(top: -imageHeight - space/2.0, left: -imageWidth, bottom: 0, right: 0)
            break
        case .right:
            imageInsets = UIEdgeInsets(top: 0, left: labelWidth + space/2.0, bottom: 0, right: -labelWidth - space/2.0)
            labelInsets = UIEdgeInsets(top: 0, left: -imageWidth - space/2.0, bottom: 0, right: imageWidth + space/2.0)
            break
        }
        self.imageEdgeInsets = imageInsets
        self.titleEdgeInsets = labelInsets
    }
}

• 默认UIButton 图片在左侧，文字在右侧，图文之间无间距

  

• 设置：图片在左侧，文字在右侧，间距为10

  • btn1.kw_set(image: .left, spacing: 10)
  • [btn1 kw_setWithImage:PositionLeft spacing:10];

• 设置：图片在右侧，文字在左侧，间距为10

  • btn2.kw_set(image: .right, spacing: 10)
  • [btn2 kw_setWithImage:PositionRight spacing:10];

• 设置：图片在上侧，文字在下侧，间距为10

  • btn3.kw_set(image: .top, spacing: 10)
  • [btn3 kw_setWithImage:PositionTop spacing:10];

  

• 设置：图片在下侧，文字在上侧，间距为10

  • btn4.kw_set(image: .bottom, spacing: 10)
  • [btn4 kw_setWithImage:PositionBottom spacing:10];

  

===========================================================================

（二）UIImage拓展【重写图片颜色、 TZImagePickerController 使用 、图片压缩 、视频压缩】

1. 修改图标颜色

• ios13后可使用open func withTintColor(_ color: UIColor) -> UIImage 方法直接修改

• ios13前需要自行绘制新图片

• UIImage(named: "icon_gongzuotai02")!.kw_tintColor(.red)

• [[UIImage imageNamed:@"icon_gongzuotai02"] kw_tintColor:[UIColor redColor]]

  

2. 图片压缩

• 一般可使用public func jpegData(compressionQuality: CGFloat) -> Data? 系统方法进行压缩
• 某些情况下，例如上传时需要把图片压缩到指定大小
  • data = UIImage(named: "233")!.kw_compressedToData(maxSize: 100)
  • 将 图片压缩到 100kb 以内

3. 视频压缩

• 调用 UIImageExt 文件中的 kw_compressedVideoToUrlStr 方法，返回视频的url地址、视频尺寸、时长【测试能将25M的视频压缩至2M】
• 1. TZImagePickerController 选择视频
  • swift在使用 TZImagePickerController 时，block回调代码不提示，需手动填写
  • tz.didFinishPickingVideoHandle = { coverImage,asset in }
• 2. 选择视频回调中，调用方法
  • UIImage.kw_compressedVideoToUrlStr(asset!) { urlStr ,size ,duration in }
• 3. 处理上传操作，操作完成后需要删除文件
  • UIImage.removeFile(filePath: urlStr!)