iOS知识小积

1.iOS 拨打电话的三种方式 -swift

// 有提示
 let callWebView = UIWebView()
 callWebView.loadRequest(URLRequest(url:URL(string: "tel:\(10086)")!))
 self.addSubview(callWebView)
 //2.有提示
 UIApplication.shared.openURL(URL(string: "telprompt://10086")!)
//3.无提示
UIApplication.shared.openURL(URL(string: "tel://10086")!)

2.iOS 汉字转拼音 -swift

// 拓展一个String的类方法
extension String{
    /**
     * 中文转拼音，处理带有多音字
     * polyphoneArr: 需要被处理的多音字数组 
     * Dictionnary<String,String>  value：需要被替换的多音字；key：用于替换的拼音
     */
    func transformMandarinToLatin(_ polyphoneArr: [[String : String]]?)->String{
        var tempStr = self
        if polyphoneArr != nil{
            for polyphone in polyphoneArr!{
                for (key, value) in polyphone{
                    if self.contains(value){
                        tempStr = tempStr.replacingOccurrences(of: value, with: key)
                    }
                }
            }
        }
        let mutableStr = NSMutableString(string: tempStr) as CFMutableString
        CFStringTransform(mutableStr, nil, kCFStringTransformToLatin, false) // 转换成带有音调的拼音
        CFStringTransform(mutableStr, nil, kCFStringTransformStripDiacritics, false) // 去掉声调
        tempStr = (mutableStr as String).replacingOccurrences(of: " ", with: "") // 去掉空格
        return tempStr
    }
}
// Demo
 let str1 = "长藏"
 let result = str1.transformMandarinToLatin([["chang" : "长"], ["cang": "藏"]])
 print(result) // changcang

3.iOS self.navigationItem.titleView来设置titleview，并且要求达到和屏幕一样宽 -swift

// 通过重写 UIView 的 setFrame方法实现
    override var frame: CGRect{
        didSet{
            var newFrame = frame
            newFrame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 34)
            super.frame = newFrame
        }
    }
// Demo
let titleView = CustomNavView()
titleView.backgroundColor = UIColor.blue
self.navigationItem.titleView = titleView

demo.png

4.iOS计算字符串的长度 -swift

/** 计算字符串的尺寸 */
 func getStringSize(str: String,font: UIFont)->CGSize{
     let attributes = [NSFontAttributeName: font]
     let size = (str as NSString).size(attributes: attributes)
     return size
}

5.iOS 生成二维码、条形码 -swift

// 二维码生成
func createQRCodeImage(codeString: String,size: CGSize,qrColor:UIColor,bkColor:UIColor,qrImageName: String? = nil)-> UIImage?{
    let stringData = codeString.data(using: String.Encoding.utf8)
    // 创建一个二维码的滤镜
    let qrFilter = CIFilter(name: "CIQRCodeGenerator")
    // 设置二维码包含的信息
    qrFilter?.setValue(stringData, forKey: "inputMessage")
    // 设置二维码的容错率
    qrFilter?.setValue("H", forKey: "inputCorrectionLevel")
    
    //上色
    let colorFilter = CIFilter(name: "CIFalseColor", withInputParameters: ["inputImage":qrFilter!.outputImage!,"inputColor0":CIColor(cgColor: qrColor.cgColor),"inputColor1":CIColor(cgColor: bkColor.cgColor)])
    // 获取生成的二维码图片
    let qrImage = colorFilter!.outputImage
    // 放大二维码图片
    let codeImage = UIImage(ciImage: qrImage!.applying(CGAffineTransform(scaleX: 8, y: 8)))
    // 通常,二维码都是定制的,中间都会放想要表达意思的图片
    if let iconImageName = qrImageName{
        let rect = CGRect(x: 0,y: 0,width: codeImage.size.width,height: codeImage.size.height)
        UIGraphicsBeginImageContextWithOptions(rect.size, false, UIScreen.main.scale)
        codeImage.draw(in: rect)
        let avatarSize = CGSize(width: rect.size.width/4,height: rect.size.height/4)
        let x = (rect.width-avatarSize.width)*0.5
        let y = (rect.height-avatarSize.height)*0.5
        _ = UIImage(named:iconImageName)?.draw(in: CGRect(x: x,y: y,width: avatarSize.width,height: avatarSize.height))
        let resultImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return resultImage
    }
    return codeImage
}

// 生成条形码
func createCode128(codeString:String, size:CGSize,qrColor:UIColor,bkColor:UIColor )->UIImage?
{
    let stringData = codeString.data(using: String.Encoding.utf8)
    
    
    //系统自带能生成的码
    //        CIAztecCodeGenerator 二维码
    //        CICode128BarcodeGenerator 条形码
    //        CIPDF417BarcodeGenerator
    //        CIQRCodeGenerator     二维码
    let qrFilter = CIFilter(name: "CICode128BarcodeGenerator")
    qrFilter?.setDefaults()
    qrFilter?.setValue(stringData, forKey: "inputMessage")
    
    
    
    let outputImage:CIImage? = qrFilter?.outputImage
    let context = CIContext()
    let cgImage = context.createCGImage(outputImage!, from: outputImage!.extent)
    
    var image = UIImage(cgImage: cgImage!, scale: 1.0, orientation: UIImageOrientation.up)
    
    
    // Resize without interpolating
    let scaleRate:CGFloat = 20.0
    
    let width    = image.size.width * scaleRate;
    let height   = image.size.height * scaleRate;
    
    UIGraphicsBeginImageContext(CGSize(width: width,height: height));
    let context1 = UIGraphicsGetCurrentContext();
    context1!.interpolationQuality = CGInterpolationQuality.none;
    image.draw(in: CGRect(x: 0,y: 0,width: width,height: height))
    
    image = UIGraphicsGetImageFromCurrentImageContext()!;
    UIGraphicsEndImageContext();
    
    return image
}