如何更改 Objective-C 中字符串数组中的子字符串？

Question

I have a weird error with decoding & sign so its always shown as & , so && will be && , a&b is shown as a&b etc.

I have those weird characters in my array of strings sometimes, so I want to remove them. To be more clear, if I have an array like this:

"str1", "a&b", "12345", "d&&emo&"

I want to it to be:

"str1", "a&b", "12345", "d&&emo&"

So all & should be changed into just & .

This is the code I tried, but it didn't help. Elements are not changing their values:

for (int i = 0; i <= self.array-1; i++)
{
    NSLog(@"%@", self.array[i]);
    [self.array[i] stringByReplacingOccurrencesOfString:@"&amp;" withString:@"&"];
    NSLog(@"%@", self.array[i]);
}

I am new to Objective-C.

Answer 1

NSString instances are immutable, which means you can't change them once they are created. The stringByReplacingOccurencesOfString:withString: method actually returns a new NSString instance. You could use NSMutableString , or alternatively, you can create a new array containing the replacement strings, eg:

NSMutableArray *newArray = [NSMutableArray array];
for (NSString *input in self.array)
{
    NSString *replacement = [input stringByReplacingOccurrencesOfString:@"&" withString:@"&"];   
    [newArray addObject:replacement];
}

self.array = newArray;