how to convert NSString to NSArray [duplicate]

问题

I have a string like

NSString* str = @"[90, 5, 6]";

I need to convert it to an array like

NSArray * numbers = [90, 5 , 6];

I did a quite long way like this:


+ (NSArray*) stringToArray:(NSString*)str
{
    NSString *sep = @"[,";
    NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:sep];
    NSArray *temp=[str componentsSeparatedByCharactersInSet:set];

    NSMutableArray* numbers = [[NSMutableArray alloc] init];
    for (NSString* s in temp) {
        NSNumber *n = [NSNumber numberWithInteger:[s integerValue]];
        [numbers addObject:n];
    }

    return numbers;
}

Is there any neat and quick way to do such conversion?

Thanks

回答1:

First remove the unwanted characters from the string, like white spaces and braces:

NSString* str = @"[90, 5, 6]";
NSCharacterSet* characterSet = [[NSCharacterSet
                                 characterSetWithCharactersInString:@"0123456789,"] invertedSet];
NSString* newString = [[str componentsSeparatedByCharactersInSet:characterSet]
                       componentsJoinedByString:@""];

You will have a string like this: 90,5,6. Then simply split using the comma and convert to NSNumber:

NSArray* arrayOfStrings = [newString componentsSeparatedByString:@","];
NSMutableArray* arrayOfNumbers = [NSMutableArray arrayWithCapacity:arrayOfStrings.count];
for (NSString* string in arrayOfStrings) {
    [arrayOfNumbers addObject:[NSDecimalNumber decimalNumberWithString:string]];
}

Using the NSString category from this response it can be simplified to:

NSArray* arrayOfStrings = [newString componentsSeparatedByString:@","];
NSArray* arrayOfNumbers = [arrayOfStrings valueForKey: @"decimalNumberValue"];

回答2:

NSString* str = @"[90, 5, 6]";
NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"[] "];
NSArray *array = [[[str componentsSeparatedByCharactersInSet:characterSet]
                        componentsJoinedByString:@""]     
                        componentsSeparatedByString:@","];

回答3:

Try like this

NSArray *arr = [string componentsSeparatedByString:@","];

回答4:

NSString *newSTR = [str stringByReplacingOccurrencesOfString:@"[" withString:@""];

newSTR = [newSTR stringByReplacingOccurrencesOfString:@"]" withString:@""];

NSArray *items = [newSTR componentsSeparatedByString:@","];

回答5:

You can achieve that using regular expression　

([0-9]+)

NSError* error = nil;
NSString* str = @"[90, 5, 6]";
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"([0-9]+)" options:0 error:&error];
NSArray* matches = [regex matchesInString:str options:0 range:NSMakeRange(0, [str length])];

Then you have a NSArray of string, you just need to iterate it and convert the strings to number and insert them into an array.

来源：https://stackoverflow.com/questions/25501898/how-to-convert-nsstring-to-nsarray

标签

ios

objective-c

nsstring

nsarray