如何使用目标C限制UILabel文本？

Question

I have created Tableview cell with custom UILabel . For this UILabel data, I am loading from NSMutableArray . NSMutableArray data loading from JSON . Now the problem is I need to limit the tableview cell UILabel text. Here below one example

Now :

-------------------------
12.132454556
-------------------------

Needed :

-------------------------
12.13
-------------------------

My Code :

pointbl.text = [NSString stringWithFormat:@"%@",[arraydata objectAtIndex:indexPath.row]];

Above tableview cell label data I need to show 5 digits only including "." . Some times NSMutableArray value will come "null" , So based on that also I need to make some solution.

I have tried by using below code but, If my value "null" then its throwing exceptions.

temp = [[arraydata objectAtIndex:indexPath.row]stringValue];

        if ([temp length] > 5) {
            NSRange range = [temp rangeOfComposedCharacterSequencesForRange:(NSRange){0, 5}];
            temp = [temp substringWithRange:range];
        }

Answer 1

The simplest solution would be to add temp != nil to the if statement.

However, you may implement this in a different way. What's the type of the objects that are saved in arraydata ? If's it a float value (and not a string, as can be concluded from your code samples), you can simply use NSNumberFormatter for the display. Even simpler, you can use: [NSString stringWithFormat:@"0.2f", floatValue] and it will give you at least most of what you're looking to achieve.

Answer 2

// as you are loading values from json so, it can have "null" value ("null" in string format, different from nil if object is empty)

float a = [yourValue floatValue];
label.text = [NSString stringWithFormat:@"%.2f",a];

Answer 3

Try to convert to float:

    if ([arraydata objectAtIndex:indexPath.row] != nil) {
        pointbl.text = [NSString stringWithFormat:@"%.2f%%",[[arraydata objectAtIndex:indexPath.row]floatValue]];
    }
    else {
        pointbl.text = @"0";
    }