concatenating NSStrings not work

I am trying to concatenate the contents of an NSMutableArray using

NSString* result = @""; 

for(NSString* test in  self.selectedOnes) {

    NSLog(t开发者_JAVA百科est) ; 
    [result stringByAppendingString:test];
    [result stringByAppendingString:@","];
}

but result remains @"", I am sure that the selectedOnes contains data because it writes to the log.

Any suggestions?

---

You can use the componentsJoinedByString method which "Constructs and returns an NSString object that is the result of interposing a given separator between the elements of the array",

NSString *result = [self.SelectedOnes componentsJoinedByString:@","];

---

stringByAppendingString: returns a new String.

This should work.

NSString* result = @""; 

for(NSString* test in  self.SelectedOnes  )
{
    NSLog( test ) ; 
    result = [result stringByAppendingString:test];
    result = [result stringByAppendingString:@","];
}

---

stringByAppendingString: returns a new string

Use it like this:

NSString* result = @""; 

for(NSString* test in  self.SelectedOnes  )
{
    NSLog( test ) ; 



    result = [result stringByAppendingString:test];
    result = [result stringByAppendingString:@","];


}

---

Try this way

result = test;
result = [result stringByAppendingString:@","];