给照片添加文字水印（图片上写文字，并可修改位置和样式）

//--- UIImageExtension.swift ---

//水印位置枚举

//添加水印方法

func waterMarkedImage(waterMarkText:String, corner:WaterMarkCorner = .BottomRight,

margin:CGPoint = CGPoint(x: 20照片英文水印样式, y: 20), waterMarkTextColor:UIColor = UIColor.whiteColor(),

waterMarkTextFont:UIFont = UIFont.systemFontOfSize(20),

backgroundColor:UIColor = UIColor.clearColor()) -> UIImage{

let textAttributes = [NSForegroundColorAttributeName:waterMarkTextColor,

NSFontAttributeName:waterMarkTextFont]

let textSize = NSString(string: waterMarkText).sizeWithAttributes(textAttributes)

var textFrame = CGRectMake(0, 0, textSize.width, textSize.height)

textFrame.origin = margin

textFrame.origin = CGPoint(x: imageSize.width - textSize.width - margin.x, y: margin.y)

textFrame.origin = CGPoint(x: margin.x, y: imageSize.height - textSize.height - margin.y)

textFrame.origin = CGPoint(x: imageSize.width - textSize.width - margin.x,

y: imageSize.height - textSize.height - margin.y)

// 开始给照片添加文字水印

UIGraphicsBeginImageContext(imageSize)

self.drawInRect(CGRectMake(0, 0,imageSize.width照片英文水印样式, imageSize.height))

NSString(string: waterMarkText).drawInRect(textFrame, withAttributes: textAttributes)

let waterMarkedImage = UIGraphicsGetImageFromCurrentImageContext()

UIGraphicsEndImageContext()

return waterMarkedImage

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