UIView+Extension

import UIKit

extension UIView {
    //扩展方法加载这里
}

自定义控件圆角位置 如：只左上 左下有圆角

func addCorner(roundingCorners: UIRectCorner,cornerSize: CGSize) {
        let path = UIBezierPath(roundedRect: bounds,byRoundingCorners: roundingCorners,cornerRadii: cornerSize)
        let cornerLayer = CAShapeLayer()
        cornerLayer.frame = bounds
        cornerLayer.path = path.cgPath
        layer.mask = cornerLayer
    }

btn.addCorner(roundingCorners:  [.topLeft,.bottomLeft],cornerSize: CGSize(width:4,height:4))

UIImage+Extension

修剪图片尺寸

func imageByCroppingImage(_ size: CGSize) -> UIImage {
        var returnImage: UIImage?
        var scaleFactor: CGFloat = 1.0
        var scaledWidth = size.width
        var scaledHeight = size.height
        var thumbnailPoint = CGPoint(x: 0,y: 0)

        if !self.size.equalTo(size) {
            let widthFactor = size.width / self.size.width
            let heightFactor = size.height / self.size.height

            if widthFactor > heightFactor {
                scaleFactor = widthFactor
            } else {
                scaleFactor = heightFactor
            }

            scaledWidth = self.size.width * scaleFactor
            scaledHeight = self.size.height * scaleFactor

            if widthFactor > heightFactor {
                thumbnailPoint.y = (size.height - scaledHeight) * 0.5
            } else if widthFactor < heightFactor {
                thumbnailPoint.x = (size.width - scaledWidth) * 0.5
            }
        }

        UIGraphicsBeginImageContextWithOptions(size,true,1)

        var thumbnailRect = CGRect.zero
        thumbnailRect.origin = thumbnailPoint
        thumbnailRect.size.width = scaledWidth
        thumbnailRect.size.height = scaledHeight

        self.draw(in: thumbnailRect)
        returnImage = UIGraphicsGetImageFromCurrentImageContext()

        UIGraphicsEndImageContext()

        return returnImage!
    }

设置圆形图片

func circleImage() -> UIImage {
        //取最短边长
        let shotest = min(self.size.width,self.size.height)
        //输出尺寸
        let outputRect = CGRect(x: 0,y: 0,width: shotest,height: shotest)
        //开始图片处理上下文（由于输出的图不会进行缩放，所以缩放因子等于屏幕的scale即可）
        UIGraphicsBeginImageContextWithOptions(outputRect.size,false,0)
        let context = UIGraphicsGetCurrentContext()!
        //添加圆形裁剪区域
        context.addEllipse(in: outputRect)
        context.clip()
        //绘制图片
        self.draw(in: CGRect(x: (shotest-self.size.width)/2,y: (shotest-self.size.height)/2,width: self.size.width,height: self.size.height))
        //获得处理后的图片
        let maskedImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return maskedImage
    }

UIButton+Extension

设置UIButton 图片文字方向和距离

//枚举图片的位置
    enum ButtonImageEdgeInsetsStyle {
        case top    //上图下文字
        case left   //左图右文字
        case bottom //下图上文字
        case right  //右图左文字
    }
    // style:图片位置 space:图片与文字的距离
    func layoutButtonImageEdgeInsetsStyle(style:ButtonImageEdgeInsetsStyle,space:CGFloat) {
        let imageWidth:CGFloat = (self.imageView?.frame.size.width)!
        let imageHeight:CGFloat = (self.imageView?.frame.size.height)!

        var labelWidth:CGFloat = 0
        var labelHeight:CGFloat = 0

        labelWidth = (self.titleLabel?.intrinsicContentSize.width)!
        labelHeight = (self.titleLabel?.intrinsicContentSize.height)!

        var imageEdgeInsets:UIEdgeInsets = UIEdgeInsets.zero
        var labelEdgeInsets:UIEdgeInsets = UIEdgeInsets.zero

        switch style {
        case .top:
            imageEdgeInsets = UIEdgeInsetsMake(-labelHeight-space/2.0,-labelWidth)
            labelEdgeInsets = UIEdgeInsetsMake(0,-imageWidth,-imageHeight-space/2.0,0)
        case .left:
            imageEdgeInsets = UIEdgeInsetsMake(0,-space/2.0,space/2.0)
            labelEdgeInsets = UIEdgeInsetsMake(0,space/2.0,-space/2.0)
        case .bottom:
            imageEdgeInsets = UIEdgeInsetsMake(0,-labelHeight-space/2.0,-labelWidth)
            labelEdgeInsets = UIEdgeInsetsMake(-imageHeight-space/2.0,0)
        case .right:
            imageEdgeInsets = UIEdgeInsetsMake(0,labelWidth+space/2.0,-labelWidth-space/2.0)
            labelEdgeInsets = UIEdgeInsetsMake(0,-labelWidth-space/2.0,labelWidth+space/2.0)
        default:
            break
        }

        self.titleEdgeInsets = labelEdgeInsets
        self.imageEdgeInsets = imageEdgeInsets
    }

（编辑：李大同）

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