1.NSString和NSDate互相转换
![](https://img.haomeiwen.com/i2508441/591229d6b55dceb9.png)
![](https://img.haomeiwen.com/i2508441/29257f7cc151ab64.png)
2.对于要转换成URL的string中有特殊字符进行转换成可用的URL: (中文空格字符编码/解码)
![](https://img.haomeiwen.com/i2508441/b81189c103e40355.png)
stringByAddingPercentEscapesUsingEncoding(只对 `#%^{}[]|\"<> 加空格共14个字符编码,不包括”&?”等符号), ios9将淘汰,
![](https://img.haomeiwen.com/i2508441/5a94a85f87084d7a.png)
URLFragmentAllowedCharacterSet "#%<>[\]^`{|}
URLHostAllowedCharacterSet "#%/<>?@\^`{|}
URLPasswordAllowedCharacterSet "#%/:<>?@[\]^`{|}
URLPathAllowedCharacterSet "#%;<>?[\]^`{|}
URLQueryAllowedCharacterSet "#%<>[\]^`{|}
URLUserAllowedCharacterSet "#%/:<>?@[\]^`
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