I want to create a comma-separated string like this.
NSString *list = @"iPhone,iPad,iPod";
I tried like this,
[strItemList appendString:[NSString stringWithFormat:@"%@,", [[arrItems objectAtIndex:i]objectForKey:@"ItemList"]]];
But the issue is I'm getting a string like this @"iPhone,iPad,iPod," Note that there is an extra comma "," at the end of the string. How can I avoid that extra comma?
Can you please give me a hint. Highly appreciated Thanks in advance
To join an array of strings into a single string by a separator (character which would be a string), you could use this method of NSArray class:
NSArray* array = @[@"iPhone", @"iPad", @"iPod"];
NSString* query = [array componentsJoinedByString:@","];
By using this method, you won't need to drop the last extra comma (or whatever) because it won't add it to the final string.
There's a couple of routes you can take.
If the number of items is always the same, and known before hand (which I guess isn't the case, but I mention it for completeness's sake), just make the whole string at once:
[NSString stringWithFormat:@"%@,%@,%@", [[arrItems objectAtIndex:0] objectForKey:@"ItemList"]], [[arrItems objectAtIndex:1] objectForKey:@"ItemList"]], [[arrItems objectAtIndex:2] objectForKey:@"ItemList"]]
Knowing that the unwanted comma will always be the last character in the string, you can make removing it the last step in construction:
} // End of loop
[strItemList removeCharactersInRange:(NSRange){[strItemList length] - 1, 1}];
Or you can change your thinking a little and do the loop like this:
NSString * comma = @"";
for( i = 0; i < [arrItems count]; i++ ){
[strItemList appendString:[NSString stringWithFormat:@"%@%@", comma, [[arrItems objectAtIndex:i]objectForKey:@"ItemList"]]];
comma = @",";
}
Notice that comma comes before the other item. Setting that string inside the loop means that nothing will be added on the first item, but a comma character will be for every other item.
After Completion of loop add below stmt
strItemList = [strItemList substringToIndex:[strItemList length]-1]
check the value of array count if array count is last then add without comma else add with comma. try this out i am not sure to much about.
if([arrItems objectAtIndex:i] == arrItems.count){
[strItemList appendString:[NSString stringWithFormat:@"%@", [[arrItems objectAtIndex:i]objectForKey:@"ItemList"]]];
}
else {
[strItemList appendString:[NSString stringWithFormat:@"%@,", [[arrItems objectAtIndex:i]objectForKey:@"ItemList"]]];
}
Assuming that arrItems is an NSArray with elements @"iPhone", @"iPad", and @"iPod", you can do this:
NSArray *list = [arrItems componentsJoinedByString:@","]
NSArray with elements @"iPhone", @"iPad", and @"iPod"
NSString *str=[[arrItems objectAtIndex:0]objectForKey:@"ItemList"]]
str = [str stringByAppendingFormat:@",%@",[[arrItems objectAtIndex:1]objectForKey:@"ItemList"]]];
str = [str stringByAppendingFormat:@",%@",[[arrItems objectAtIndex:2]objectForKey:@"ItemList"]]];
NsLog(@"%@",str);
// Assuming...
NSDictionary *dictionary1 = [NSDictionary dictionaryWithObject:[NSArray arrayWithObjects:@"iPhone", @"iPodTouch", nil] forKey:@"ItemList"];
NSDictionary *dictionary2 = [NSDictionary dictionaryWithObject:[NSArray arrayWithObjects:@"iPad", @"iPad2", @"Apple TV", nil] forKey:@"ItemList"];
NSDictionary *dictionary3 = [NSDictionary dictionaryWithObject:[NSArray arrayWithObjects:@"iMac", @"MacBook Pro", @"Mac Pro", nil] forKey:@"ItemList"];
NSArray *arrItems = [NSArray arrayWithObjects:dictionary1, dictionary2, dictionary3, nil];
// create string list
NSString *strItemList = [[arrItems valueForKeyPath:@"@unionOfArrays.ItemList"] componentsJoinedByString:@", "];
NSLog(@"All Items List: %@", strItemList);
Output: All Items List: iPhone, iPodTouch, iPad, iPad2, Apple TV, iMac, MacBook Pro, Mac Pro
This method will return you the nsmutablestring with comma separated values from an array
-(NSMutableString *)strMutableFromArray:(NSMutableArray *)arr withSeperater:(NSString *)saperator { NSMutableString *strResult = [NSMutableString string];
for (int j=0; j<[arr count]; j++)
{
NSString *strBar = [arr objectAtIndex:j];
[strResult appendString:[NSString stringWithFormat:@"%@",strBar]];
if (j != [arr count]-1)
{
[strResult appendString:[NSString stringWithFormat:@"%@",seperator]];
}
}
return strResult;
}
