I want to show the UILabel text "sunday" to uppercase "SUN" like that

How about just this

NSString *uppercaseString = [strDay uppercaseString];cell.dayLabel.text = [uppercaseString substringToIndex:3];

Assuming it has a valid day

iphone objective-c xcode uilabel

NSString *strDay = [dic objectForKey:@"day"]; NSString* split = [strDay substringToIndex:3];split=[split uppercaseString];

NSLOG (@"%@",split);

Cheers!

iphone objective-c xcode uilabel

NSString *strDay = @"sunday";NSString *newStr = [strDay substringToIndex:3];NSString *uppercaseString = [newStr uppercaseString];

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