Swift基础之init方法，静态方法，类方法的使用（多标签Demo）

Xcode更新过后，有些方法都进行了改变，Demo中有变化的都进行了简单的标记，具体以后遇见再说

创建一个UIView类，用init方法创建两种类型，显示多标签，创建静态方法进行调用，创建类方法进行调用

首先代码：用init方法创建两种类型，显示多标签

//初始化数组中是NSString类型的标签视图
    init(frame: CGRect,textArray aArray:NSArray,textFont aFont:UIFont){
        super.init(frame: frame);
        
        //首先获取宽、高，确定显示的位置
        let widthF:CGFloat = frame.size.width;
        //然后创建标签视图,注意:这个方法传过来的数组中就是NSString类型,可以直接显示
        var labelWidthF:CGFloat = 0.0;
        var labelHeightF:CGFloat = 0.0;
        for i in 0...aArray.count-1 {
            //获取内容大小
            let str = aArray[i] as! String;
            let strSize:CGSize = self.sizeWithFont(content: str as NSString , font: aFont, maxSize: CGSize.init(width: CGFloat(MAXFLOAT), height:CGFloat(MAXFLOAT)));
            //判断宽、高
            if widthF < labelWidthF+strSize.width+20 {
                labelWidthF = 0.0;
                labelHeightF = labelHeightF+strSize.height+20;
            }
            //创建Lable
            let labelL = UILabel.init(frame: CGRect.init(x: labelWidthF, y: labelHeightF, width: strSize.width+20, height: strSize.height+20));//CG系列变化了，没有了make，而是init
            labelL.text = str as String;
            labelL.textAlignment = NSTextAlignment.center;
            labelL.backgroundColor = UIColor.lightGray;//UIColor变化了,少了color
            labelL.font = aFont;
            self.addSubview(labelL);
            
            labelWidthF = labelWidthF+strSize.width+20;
        }
    }
    //初始化数组中是NSDictionary类型的标签视图
    init(frame: CGRect, textArray aArray:NSArray, keyStr aKeyStr:String, textFont aFont:UIFont){
        super.init(frame: frame);
        
        //首先获取宽、高，确定显示的位置
        let widthF:CGFloat = frame.size.width;
        //然后创建标签视图,注意:这个方法传过来的数组中是NSDictionary
        var labelWidthF:CGFloat = 0.0;
        var labelHeightF:CGFloat = 0.0;
        for i in 0...aArray.count-1 {
            //获取内容大小
            let dic:NSDictionary = aArray[i] as! NSDictionary;
            let str = dic[aKeyStr] as! String;
            let strSize:CGSize = self.sizeWithFont(content: str as NSString, font: aFont, maxSize: CGSize.init(width: CGFloat(MAXFLOAT), height:CGFloat(MAXFLOAT)));
            //判断宽、高
            if widthF < labelWidthF+strSize.width+20 {
                labelWidthF = 0.0;
                labelHeightF = labelHeightF+strSize.height+20;
            }
            //创建Lable
            let labelL = UILabel.init(frame: CGRect.init(x: labelWidthF, y: labelHeightF, width: strSize.width+20, height: strSize.height+20));//CG系列变化了，没有了make，而是init
            labelL.text = str as String;
            labelL.textAlignment = NSTextAlignment.center;
            labelL.backgroundColor = UIColor.lightGray;//UIColor变化了,少了color
            labelL.font = aFont;
            self.addSubview(labelL);
            
            labelWidthF = labelWidthF+strSize.width+20;
        }
    }

创建静态方法获取字符串大小

//创建静态方法
    func sizeWithFont(content:NSString,font aFont:UIFont,maxSize aMaxSize:CGSize) -> CGSize {
        let attrs:NSDictionary = [NSFontAttributeName : aFont];
        return content.boundingRect(with: aMaxSize, options: NSStringDrawingOptions.usesLineFragmentOrigin, attributes: attrs as? [String : Any], context: nil).size;
    }

创建一个类方法

    //创建类方法
    class func oneLabel(myLabel:UILabel) {
        myLabel.layer.cornerRadius = 5;
        myLabel.layer.borderColor = UIColor.blue.cgColor;
        myLabel.layer.borderWidth = 1;
        myLabel.clipsToBounds = true;
        myLabel.adjustsFontSizeToFitWidth = true;
    }

利用类方法创建一个Label

//创建一个Label
        let myLabel = UILabel.init(frame: CGRect.init(x: 50, y: 320, width: 200, height: 50));
        myLabel.text = "这是一个类方法设计的Lable";
        BHMoreLabelView.oneLabel(myLabel: myLabel);
        self.view.addSubview(myLabel);

有问题请留言。。。。。。。