Detect and show alert if user skip any text field to give entry

I think it is an interesting tricks to detect if used skip any text field to give entry. We can do this using a TextField delegate method

- (void)textFieldDidEndEditing:(UITextField *)textField;

Suppose your app has so many text fields  and it is very common that user may skip any text field to give entry. You can change the background colour of the text field immediately the user skips. Then the user will be aware of it .

The code is given below.

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    if([textField.text length]==0)
    {
        textField.backgroundColor=[UIColor yellowColor];
    }
    else
    {
        textField.backgroundColor=[UIColor whiteColor];
    }

    

}

I hope this post will be helpful to you . 

Happy Coding 

Mahboob 

Make your app colourful by using colour code

We all iOS Developers know that we can use some distinct colours in component's background or tint colour.  If we use custom colour code the apps will be more lucrative. I am giving a simple example,

I create a segmented control programatically and set the background colour using the colour code.
In viewDidLoad method I set the  navigations bar's tint colour and background the view using colorWithHexString method which returns colour according to the hexadecimal form of the colour code. I hope it will be helpful to you.

- (void)viewDidLoad
{
    [super viewDidLoad];
     self.navigationController.navigationBar.hidden=NO;

  [self.navigationController.navigationBar setTintColor:[self colorWithHexString:@"843C44"]];

    [self.view setBackgroundColor:[self colorWithHexString:@"845C44"]];

    

}

-(UIColor*)colorWithHexString:(NSString*)hex
{
    NSString *cString = [[hex stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

    

    

    if ([cString length] < 6) return [UIColor grayColor];

    

    

    if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];

    

    if ([cString length] != 6) return  [UIColor grayColor];

    

    

    NSRange range;
    range.location = 0;
    range.length = 2;
    NSString *rString = [cString substringWithRange:range];

    

    range.location = 2;
    NSString *gString = [cString substringWithRange:range];

    

    range.location = 4;
    NSString *bString = [cString substringWithRange:range];

    

    

    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];

    

    return [UIColor colorWithRed:((float) r / 255.0f)
                           green:((float) g / 255.0f)
                            blue:((float) b / 255.0f)
                           alpha:1.0f];
}

Now you can see how colourful your apps will be.

Happy Coding

Mahboob