5月复盘篇：iOS问题解决经验总结复盘

😋

如果有一天，你的努力配得上你的梦想，那么你的梦想也绝不会辜负你的努力。

目录
一、iOS -Base64字符与图片之间的转换
1.1图片转 base64字符串
1.2 base64转图片
二、保存截图
三、二维码生成
四、图片旋转

一、iOS -Base64字符与图片之间的转换

1.1 图片转 base64字符串

swift

//图片转 base 64
 guard let image = UIImage(named: "图片名称") else {return} 
//jpeg格式 compressionQuality: 压缩质量
 guard let imageData = image.jpegData(compressionQuality: 1) else {   return }
//png格式
  guard let imageData2 = image.pngData() else {   return   }
 let base64ImageStr = imageData.base64EncodedString(options: .lineLength64Characters)

oc

    UIImage * image = [UIImage imageNamed:@"图片名称"];
    NSData * imageData = UIImageJPEGRepresentation(image, 1);
//    NSData * imageData = UIImagePNGRepresentation(image);
    NSString * base64Str = [imageData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];

1.2 base64转图片

swift

 let base64ImageStr = "Base64字符串"
 guard  let showImageData = Data(base64Encoded: base64ImageStr, options: .ignoreUnknownCharacters) else {return}
imageView?.image = UIImage(data: showImageData )

oc

NSString * base64Str = @"图片base64字符串";
NSData * showData = [[NSData alloc]initWithBase64EncodedString:base64Str options:NSDataBase64DecodingIgnoreUnknownCharacters];
imageView.image = [UIImage imageWithData:showData];

备注：
有时候，后台返回的Base64字符是这种格式的：data:image/png;base64,iVBORw0K.............""
这个时候直接进行转换会失败，解决方法是去掉前缀："data:image/png;base64,"
eg:

var base64ImageStr = ""
if let imageUrl = model?.imgUrl{
let arr = imageUrl.components(separatedBy: ",")
base64ImageStr = arr.last ?? ""
}

二、保存截图

    @objc func saveScreenShot(){
        guard let  bgView =  view.viewWithTag(100) else { return  }
        let tempImage =   bgView.screenShot(size: bgView.size)
        guard let haveImage = tempImage else {
            showHudText("获取图片异常")
            return
        }
        
        SPAlbumManager.checkPhotoAuthState { isAuth in
            if isAuth {
                SPAlbumManager.saveImageToAlbum(image: haveImage){ [weak self]finish in
                    self?.showHudText(finish ? "保存成功" : "保存失败")
                }
            }
        }
    }

三、二维码生成

   func setQrCodeUI(){
        let codeImageView: UIImageView = {
           let imageView = UIImageView()
            view.addSubview(imageView)
            imageView.snp.makeConstraints{
                $0.centerX.equalToSuperview()
                $0.top.height.width.equalTo(200)
            }
            return imageView
        }()
        
        DispatchQueue.global(qos: .utility).async(execute: {
            let image = UIImage.setupQRCodeImage("https://apphr4pyvl34424.h5.xiaoeknow.com/p/decorate/homepage")
            DispatchQueue.main.async {
                codeImageView.image = image
            }
        })
    }

四、图片旋转

@objc func btnOnClick(btn:UIButton){
        
        if btn.tag == 0 {
            imgView.layer.add(rotationAnim, forKey: "kLightImage")
        }else{
            imgView.layer.removeAnimation(forKey: "kLightImage")
        }
        
    }
    func imgViewRo(){
        let stackView:UIStackView = UIStackView()
        stackView.distribution = .fillEqually
        stackView.alignment = .fill
        stackView.axis = .horizontal
        view.addSubview(stackView)
        stackView.snp.makeConstraints{
            $0.width.equalTo(200)
            $0.top.equalTo(100)
            $0.height.equalTo(48)
            $0.centerX.equalToSuperview()
        }
        
        for (i, element) in ["开始","暂停"].enumerated() {
            let btn = UIButton()
            btn.setTitle(element, for: .normal)
            btn.backgroundColor = UIColor.randomColor
            btn.tag = i
            btn.addTarget(self, action: #selector(btnOnClick(btn:)), for: .touchUpInside)
            stackView.addArrangedSubview(btn)
        }
        
        imgView = UIImageView()
        imgView.image = UIImage(named: "home_shop_pop_light")
        view.addSubview(imgView)
        imgView.snp.makeConstraints{
            $0.centerY.centerX.equalToSuperview()
        }
        imgView.layer.add(rotationAnim, forKey: "kLightImage")
    }

项目地址：项目下载链接

效果展示图.gif