一、截图

以下截图代码默认使用UIGraphicsBeginImageContext，图片会有点失真或模糊，如需截图的像素和View一样，请使用

 // 第一个参数表示区域大小。第二个参数表示是否是非透明的。如果需要显示半透明效果，需要传NO，否则传YES。第三个参数就是屏幕密度了
UIGraphicsBeginImageContextWithOptions(size, false, UIScreen.main.scale())

1、UIView截图

func capture(_ theView: UIView) -> UIImage {
    var rect = theView.frame
    if (theView is UIScrollView) {
        rect.size = (theView as! UIScrollView).contentSize
    }
    UIGraphicsBeginImageContext(rect.size)
    var context = UIGraphicsGetCurrentContext()!
    theView.layer.render(inContext: context)
    var img = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return img
}

2、UIScrollview截图

func capture(_ scrollView: UIScrollView) -> UIImage {
    var image: UIImage? = nil
    UIGraphicsBeginImageContext(scrollView.contentSize)
    do {
        var savedContentOffset = scrollView.contentOffset
        var savedFrame = scrollView.frame
        scrollView.contentOffset = .zero
        scrollView.frame = CGRect(x: 0, y: 0, width: scrollView.contentSize.width, height: scrollView.contentSize.height)
        scrollView.layer.render(inContext: UIGraphicsGetCurrentContext()!)
        image = UIGraphicsGetImageFromCurrentImageContext()
        scrollView.contentOffset = savedContentOffset
        scrollView.frame = savedFrame
    }
    UIGraphicsEndImageContext()
    if image != nil {
        return image
    }
    return nil
}

3、合并多张图片

func compose(withHeader header: UIImage, content: UIImage, footer: UIImage) -> UIImage {
    var size = CGSize(width: content.size.width, height: header.size.height + content.size.height + footer.size.height)
    UIGraphicsBeginImageContext(size)
    header.draw(in: CGRect(x: 0, y: 0, width: header.size.width, height: header.size.height))
    content.draw(in: CGRect(x: 0, y: header.size.height, width: content.size.width, height: content.size.height))
    footer.draw(in: CGRect(x: 0, y: header.size.height + content.size.height, width: footer.size.width, height: footer.size.height))
    var image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image
}

二、流媒体

将音频、图片转成base64Binary

class func base64Encoded(_ data: Data) -> Data {
        //base64binary(流媒体)
    var encodingTable = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "/"]
    let bytes: UInt8 = data.bytes
    var result = String(capacity: data.length)
    var ixtext = 0
    var lentext = data.length
    var ctremaining = 0
    var inbuf = [UInt8](repeating: 0, count: 3)
    var outbuf = [UInt8](repeating: 0, count: 4)
    var i: UInt16 = 0
    var charsonline: UInt16 = 0
    var ctcopy: UInt16 = 0
    var ix = 0
    while true {
        ctremaining = lentext - ixtext
        if ctremaining <= 0 {

        }
        for i in 0..<3 {
            ix = ixtext + i
            if ix < lentext {
                inbuf[i] = bytes[ix]
            }
            else {
                inbuf[i] = 0
            }
        }
        outbuf[0] = (inbuf[0] & 0xFC) >> 2
        outbuf[1] = ((inbuf[0] & 0x03) << 4) | ((inbuf[1] & 0xF0) >> 4)
        outbuf[2] = ((inbuf[1] & 0x0F) << 2) | ((inbuf[2] & 0xC0) >> 6)
        outbuf[3] = inbuf[2] & 0x3F
        ctcopy = 4
        switch ctremaining {
            case 1:
                ctcopy = 2
            case 2:
                ctcopy = 3
        }

        for i in 0..<ctcopy {
            result += "\\\\(encodingTable[outbuf[i]])"
        }
        for i in ctcopy..<4 {
            result += "="
        }
        ixtext += 3
        charsonline += 4
    }
    return result.data(usingEncoding: String.Encoding.utf8)!
}

这里调用上面的方法

class func loadingFile(_ filepath: URL) -> String {
    var data = Data(contentsOf: filepath)
    var base64Data = self.base64Encoded(data)
    var strBase64 = String(base64Data, encoding: String.Encoding.ascii)
    return strBase64
    //you can upload this base64Data to server now
}