Question

ios 上 如何像PHP那样有 urldecode 函数 如何实现

Answer 1

urlencode的目的是传输url安全的字符

比如中文, 例如"神"变成%C9%F1(如果是utf8则是%E7%A5%9E)

各种非字母的符号也会对应做编码, 比如& == %26.

而对应的urldecode就是一个还原的过程. 也就是说把%26还原为&. 中文同理

所以按说... 是不会有从 "䴙 使用urldecode后变成 䴅" 的情况. 至少从urlencode的原理上是这样.

至于你问的urldecode

参见NSURL.h, 其中

@interface NSString (NSURLUtilities)

/* Adds all percent escapes necessary to convert the receiver into a legal URL string. Uses the given encoding to determine the correct percent escapes (returning nil if the given encoding cannot encode a particular character). See CFURLCreateStringByAddingPercentEscapes in CFURL.h for more complex transformations

*/

- (NSString *)stringByAddingPercentEscapesUsingEncoding:(NSStringEncoding)enc;

/* Replaces all percent escapes with the matching characters as determined by the given encoding. Returns nil if the transformation is not possible (i.e. the percent escapes give a byte sequence not legal in the given encoding). See CFURLCreateStringByReplacingPercentEscapes in CFURL.h for more complex transformations

*/

- (NSString *)stringByReplacingPercentEscapesUsingEncoding:(NSStringEncoding)enc;

@end