Swift 常用方法总结

1、设置AttributeStringText

 //MARK: - 设置富文本 func setAttributeStringText(strFullText:String, andFullTextFont textFont:UIFont, andFullTextColor textColor:UIColor, withChangeText changeText:String, withChangeFont changFont:UIFont, withChangeColor changeColor:UIColor) -> NSAttributedString{        let attributeString = NSMutableAttributedString.init(string: strFullText)        //需要改变的文本    var range = NSString.init(string: strFullText).range(of: changeText)    attributeString.addAttributes([        NSFontAttributeName:changFont,        NSForegroundColorAttributeName:changeColor,        ], range: range)        //不需要改变的文本    let oldText = NSString.init(string: strFullText).replacingOccurrences(of: changeText, with: "")    range = NSString.init(string: strFullText).range(of: oldText)    attributeString.addAttributes([        NSFontAttributeName:textFont,        NSForegroundColorAttributeName:textColor,        ], range: range)        return attributeString }

2、是否含有Emoji表情

 //MARK: - Emoji表情检测 //是否含有Emoji 表情(true 含有) func stringContainsEmoji(string:String)->Bool{    var returnValue = false;    let Str = NSString(format: "%@", string);        Str.enumerateSubstrings(in: NSMakeRange(0, Str.length), options: NSString.EnumerationOptions.byComposedCharacterSequences) { (substring, substringRange, enclosingRange, stop) in                let subStr = NSString(format: "%@", substring!);        let hs = subStr.character(at: 0);        // surrogate pair        if (0xd800 <= hs && hs <= 0xdbff) {            if (subStr.length > 1) {                let ls = subStr.character(at: 1);                let uc = Int(((hs - 0xd800) * 0x400) + (ls - 0xdc00)) + 0x10000;                if (0x1d000 <= uc && uc <= 0x1f77f){                    returnValue = true;                }            }        }        else if (subStr.length > 1) {            let ls = subStr.character(at: 1);            if (ls == 0x20e3){                returnValue = true;            }        }        else {            // non surrogate            if (0x2100 <= hs && hs <= 0x27ff){                returnValue = true;            }            else if (0x2B05 <= hs && hs <= 0x2b07){                returnValue = true;            }            else if (0x2934 <= hs && hs <= 0x2935){                returnValue = true;            }            else if (0x3297 <= hs && hs <= 0x3299){                returnValue = true;            }            else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50){                returnValue = true;            }        }    };          return returnValue; }

3、获取文本的宽度

 //MARK: - 获取文本的宽度 func getWidthForString(strTitle:String,txtFont:UIFont) -> CGFloat {    var fw = CGFloat.init(0)        let size = NSString.init(string: strTitle).size(attributes: [        NSFontAttributeName:txtFont        ])    fw = size.width        return fw }

4、字典转换为Json String

   /**    * 字典转换为JSONString    * @parameter dictionary: 字典参数    * @returns: JSONString    */    func getJSONStringFromDictionary(dictionary:NSDictionary) -> String {        if (!JSONSerialization.isValidJSONObject(dictionary)) {            print("无法解析出JSONString")            return ""        }        let data : NSData! = try? JSONSerialization.data(withJSONObject: dictionary, options: []) as NSData!        let JSONString = NSString(data:data as Data,encoding: String.Encoding.utf8.rawValue)        return JSONString! as String    }

5、UISearchBar样式属性修改

//MARK: - UISearchBar相关设置//清除查询框背景func clearnSearchBarBg(searchView:UISearchBar){    for item:UIView in (searchView.subviews) {        for subview:UIView in item.subviews {            if subview.isKind(of: UITextField.classForCoder()) {                //将搜索文本框的背景去掉                for obj in subview.subviews {                    obj.removeFromSuperview()                }            }        }    }}//设置取消按钮为中文func setSearchBarCancle(searchView:UISearchBar){    for item:UIView in (searchView.subviews) {        for subview:UIView in item.subviews {            //更改取消按钮            if subview.isKind(of:UIButton.classForCoder()) {                let btnCancle:UIButton = subview as! UIButton                //修改文本                btnCancle.setTitle("取消", for: .normal)                //修改背景                btnCancle.backgroundColor = UIColor.clear            }        }    }}//设置提示文本字体大小func setSearchBarFont(searchView:UISearchBar,font:UIFont){    for item:UIView in (searchView.subviews) {        for subview:UIView in item.subviews {            if subview.isKind(of: UITextField.classForCoder()) {              (subview as? UITextField)?.font = font            }        }    }}