NSString

• 1、创建
• 2、信息
• 拓展 NSURLUtilities

Foundation - NSString : NSObject

1、创建

2、信息

拓展 NSURLUtilities

@interface NSString (NSURLUtilities)

// Returns a new string made from the receiver by replacing all characters not in the allowedCharacters set with percent encoded characters. UTF-8 encoding is used to determine the correct percent encoded characters. Entire URL strings cannot be percent-encoded. This method is intended to percent-encode an URL component or subcomponent string, NOT the entire URL string. Any characters in allowedCharacters outside of the 7-bit ASCII range are ignored.
- (nullable NSString *)stringByAddingPercentEncodingWithAllowedCharacters:(NSCharacterSet *)allowedCharacters API_AVAILABLE(macos(10.9), ios(7.0), watchos(2.0), tvos(9.0));

// Returns a new string made from the receiver by replacing all percent encoded sequences with the matching UTF-8 characters.
@property (nullable, readonly, copy) NSString *stringByRemovingPercentEncoding API_AVAILABLE(macos(10.9), ios(7.0), watchos(2.0), tvos(9.0));
@end