如何在Objective-C中比较字符串对象？

Question

Actually I want to populate an array to fill up my table view, but the problem is I have to compare two strings and if they match I wanted to add that string in the array. Here is my code:

for (NSDictionary *item in facilityZoneData) {
    NSString *zoneFacilityID = [NSString stringWithFormat:@"%@",[item objectForKey:@"FacilityId"]]; 

    if ([detailFacility isEqualToString:zoneFacilityID ]) {
        NSLog(@"object added");
    }
}

The detailFacility is NSString object which is declared in the header file. The problem is it is not at all comparing the string. I know that there are surely some values which are equal. tell me if I am missing something

Answer 1

Your question is not clear. To compare strings you use

NSString isEqualToString: NSString

Like you did. Before your if-statement NSLog the detailFacility and zoneFacilityID objects to see what they contain. Cheers

Answer 2

yea..i had the same problem a few days ago

i made a work-around. Do this:

if ([detailFacility UTF8String] == [zoneFacilityID UTF8String] ){ ...}

for some reason nsstring compassion is comparing addresses and pointers...try this and tell me if it works

i dont know why but that works for me :/

if it doesnt work..just use c function:

if(!strcmp([detailFacility UTF8String],[zoneFacilityID UTF8String])){
<are equal>
}else{
<aren't equal>
}