在objective-c中的urldecode

Question

I'm dealing with an urlencoded string in objective-c. Is there a foundation function that actually reverse the urlENCODING?

The string received is like: K%FChlschrank but should be after decoding Kühlschrank

Answer 1

I made a quick category to help resolve this :)

@interface NSString (stringByDecodingURLFormat)
- (NSString *)stringByDecodingURLFormat;
@end

@implementation NSString
- (NSString *)stringByDecodingURLFormat
{
    NSString *result = [(NSString *)self stringByReplacingOccurrencesOfString:@"+" withString:@" "];
    result = [result stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    return result;
}
@end

Once defined, this quickly can handle an encoded string:

NSString *decodedString = [myString stringByDecodingURLFormat];

Plenty of other ways to implement.

Answer 2

I believe this is what you are looking for:

- (NSString *)stringByReplacingPercentEscapesUsingEncoding:(NSStringEncoding)encoding

Return Value:

A new string made by replacing in the receiver all percent escapes with the matching characters as determined by the given encoding. It returns nil if the transformation is not possible, for example, the percent escapes give a byte sequence not legal in encoding.

[source: Apple NSString Class Reference]

Answer 3

- (NSString *)URLDecode:(NSString *)stringToDecode
{
    NSString *result = [stringToDecode stringByReplacingOccurrencesOfString:@"+" withString:@" "];
    result = [result stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    return result;
}

That's it

Answer 4

Apple has depreacted stringByReplacingPercentEscapesUsingEncoding: since iOS9. Please use stringByRemovingPercentEncoding .

The new method, Returns a new string made from the receiver by replacing all percent-encoded sequences with the matching UTF-8 characters.

Example:

NSString *encodedLink = @"hello%20world";
NSString *decodedUrl = [encodedLink stringByRemovingPercentEncoding];
NSLog (@"%@", decodedUrl);

Output:

hello world

Answer 5

According to W3Schools , URLs can only be sent over the Internet using the ASCII character set. For me this piece of code worked:

NSString *original = @"K%FChlschrank";

NSString *result2 = [original stringByReplacingPercentEscapesUsingEncoding:NSASCIIStringEncoding];

Answer 6

对于iOS 9上的parmanent解决方案，请使用休眠代码

NSURL* link = [NSURL URLWithString:[url stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]];