replace an object inside nsmutablearray

Question

I have a NSMutableArray where i want to replace the sign | into a ; how can i do that?

NSMutableArray *paths = [dic valueForKey:@"PATH"];
NSLog(@"pathArr ",  paths)
pathArr (
    (
       "29858,39812;29858,39812;29925,39804;29936,39803;29949,39802;29961,39801;30146,39782;30173,39779;30220,39774;30222,39774|30215,39775;30173,39779;30146,39782;29961,39801;29949,39802;29936,39803;29925,39804;29858,39812;29858,39812;29856,39812;29800,39819;29668,39843;29650,39847;29613,39855;29613,39855;29613,39856;29605,39857;29603,39867;29603,39867;29599,39892;29596,39909;29587,39957;29571,40018;29563,40038;29560,40043"
    )
)

Update

This is where i got my path from

NSArray *BusRoute = alightDesc;
int i;
int count = [BusRoute count];
for (i = 0; i < count; i++)
{   
    NSLog (@"BusRoute = %@", [BusRoute objectAtIndex: i]);
    NSDictionary *dic = [BusRoute objectAtIndex: i];
    NSMutableArray *paths = [dic valueForKey:@"PATH"];
}

There's only one object inside your array, and it's a string. Your problem is removing these characters from the string, not objects from an array. — jscs
– jscs, Commented Aug 16, 2012 at 18:07

Neo · Accepted Answer · 2012-08-16 07:15:06Z

2

Provide that your object in the array path is string, you can do this

NSMutableArray *path2=[[NSMutableArray alloc]initWithArray:nil];
for (NSObject *obect in path) {
    for (NSString *string in (NSArray*)obect) {
        [path2 addObject:[string stringByReplacingOccurrencesOfString:@"|" withString:@","]];
    }

}

NSLog(@"pathArr %@ ",  path2);

your array paths contains an another array which has string as object. Hope this helps

edited Aug 16, 2012 at 7:15

answered Aug 16, 2012 at 6:35

Neo

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8 Comments

sihao Over a year ago

got an error for it -[__NSArrayM stringByReplacingOccurrencesOfString:withString:]: unrecognized selector sent to instance 0x91ccc0

Neo Over a year ago

can you paste your code? are you sure you called that function using string object?

sihao Over a year ago

wat do u mean? [path2 addObject:[string stringByReplacingOccurrencesOfString:@"|" withString:@","]]; this line got the error

Neo Over a year ago

for (NSString *string in paths) did you used this condition

sihao Over a year ago

yup i used

NSMutableArray *path2=[[NSMutableArray alloc]initWithArray:nil]; for (NSString *string in paths) {     [path2 addObject:[string stringByReplacingOccurrencesOfString:@"|" withString:@";"]];  }

|

polterfest · Accepted Answer · 2012-08-16 06:37:54Z

0

//Copy the Array into a String

NSString *str = [paths componentsJoinedByString: @""];

//then replace the "|"

str = [str stringByReplacingOccurrencesOfString:@"|" withString:@";"];

answered Aug 16, 2012 at 6:37

polterfest

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Comments

chrisl212 · Accepted Answer · 2012-08-16 06:57:58Z

0

i did this to replace a string in a .plist so it might work for you

    array1 = [NSMutableArray arrayWithContentsOfFile:Path1];
NSString *item = [@"dfdfDF"];
[array1 replaceObjectAtIndex:1 withObject:item];

        [array1 writeToFile:Path1 atomically:YES];
    NSLog(@"count: %@", [array1 objectAtIndex:1]);

answered Aug 16, 2012 at 6:57

chrisl212

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Comments

frankWhite · Accepted Answer · 2012-08-16 07:05:55Z

0

you may cast or convert paths to NSString and then do:

paths  = (NSString *) [paths stringByReplacingOccurrencesOfString:@"|" withString:@";"];

if this does't work, create new NSString instance that containing pathArr text, invoke replaceOccurrences method and do invert conversion

 NSMutableString *tempStr = [[NSMutableString alloc] init];
 for (int i = 0; i < [paths count]; i++) 
{  
   [tempStr appendString:[path objectAtIndex:i]];
}

then use this method for tempStr. And then try:

NSArray *newPaths = [tempStr componentsSeparatedByString:@";"];

may be last method not completely correct, so try experiment with it.

edited Aug 16, 2012 at 7:05

answered Aug 16, 2012 at 6:34

frankWhite

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1 Comment

sihao Over a year ago

Got a warning tat saysNSMutableArray may not respond to stringByReplacingOccurrencesOfString:with String.

Zhang · Accepted Answer · 2012-08-16 07:25:33Z

0

Uh, why don't you just go:

NSString *cleanedString = [[[dic valueForKey:@"PATH"] objectAtIndex:0] stringByReplacingOccurrencesOfString:@";" withString:@"|"];

If there are more than one nested array, you can go

for(int i = 0; i < [[dic valueForKey:@"PATH"] count]; i++)
{
    NSString *cleanedString = [[[dic valueForKey:@"PATH"] objectAtIndex:i] stringByReplacingOccurrencesOfString:@";" withString:@"|"];

    // do something with cleanedString
}

answered Aug 16, 2012 at 7:25

Zhang

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