ios - 如何解码 objective-c 中的特殊字符

Question

我是 iphone 开发的新手，正在开发一个演示应用程序，因为我得到了一个像“abc%26def”这样的字符串，我想解码这种类型的文本以进行实际测试，我知道它非常基本的问题，但仍然我无法从链接中找到任何解决方案，所以任何伙伴都可以帮助我吗？

我的代码如下

 if(i%3==0)
                {
                    [dataDictionary setValue:[dataDictionary valueForKey:TRIPPER__KEY] forKey:CONTENT_KEY];
                    [dataDictionary setValue:CELL_TEXTFIELD_TRIPPER_COUNT forKey:@"cellIdentifier"];
                }
                else if(i%3==1)
                {

                    //*name = [(NSString *)self stringByReplacingOccurrencesOfString:@"+" withString:@" "];
                    NSString *name = [[dataDictionary valueForKey:NAME_KEY] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
                    [dataDictionary setValue:name forKey:CONTENT_KEY];
                    [dataDictionary setValue:CELL_TEXTFIELD_TRIPPER_NAME forKey:@"cellIdentifier"];
                    [dataDictionary setValue:@"Triper Name" forKey:@"placeHolder"];
                }

Answer 1

我认为这肯定有效

NSString *str = @"abc%26def";   //put any string that you want
NSCharacterSet *setToKeep = [NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"];
NSCharacterSet *setToRemove = [setToKeep invertedSet]; //inverted set will have all other remaining symbol, char etc
NSString *newString =[[str componentsSeparatedByCharactersInSet:setToRemove]componentsJoinedByString:@""]; //this is the decoded string
NSLog(@"%@",newString);

如果您还需要更多内容，请发表评论，我会修改答案。