Remove spaces from iOS Study Notes 19-NSString

 

Problem description]

In some cases, the field returned by the server contains spaces. This space is accidentally knocked out by the server developer, but the client needs to protect it, therefore, the client needs to filter out spaces in the string.

[Problem Analysis]
1. Use stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceCharacterSet] In NSString to remove spaces between the left and right sides;
2. Use NSString * strUrl = [urlString stringByReplacingOccurrencesOfString: @ "" withString: @ ""]; remove spaces. Note that the strUrl generated at this time is the autorelease attribute, do not consider performing the release operation on strUrl.

[Problem Summary]
Use the stringByReplacingOccurrencesOfString method to remove spaces. In fact, only character replacement is performed. Besides spaces, other characters can be replaced. Currently, this method is only used once and its side effects cannot be determined.