How to set the validation for Full name field using Objective C?

Full name field validation using Objective C code.

if ([self validate:self.fullnamefield.text] == 0)

{

        NSLog(@"Please Enter Valid User Name");

}

- (BOOL)validate:(NSString *)string

{

    NSError *error             = NULL;

    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[a-zA-Z .]" options:0 error:&error];

    

    NSUInteger numberOfMatches = [regex numberOfMatchesInString:string options:0 range:NSMakeRange(0, [string length])];

    

    return numberOfMatches == string.length;

}

How to compress image without quality loss using Objective C?

Compress image, without quality loss using Objective C code:

NSData *imageData1= nil;

imageData1 =UIImageJPEGRepresentation([self compressForUpload:self.imageView.image scale:1.0], 0.8);

-(UIImage *)compressForUpload:(UIImage *)original scale:(CGFloat)scale

{

    CGSize originalSize = original.size;

    CGSize newSize = CGSizeMake(originalSize.width  *scale, originalSize.height  *scale);

    

    UIGraphicsBeginImageContext(newSize);

    [original drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];

    UIImage* compressedImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    return compressedImage;

}

How to make a phone call programmatically in iOS?

I struggled lot to find this solution to make a call from iPhone using Objective C code.
Please use the below code to solve that issue.

Objective C:

NSString *phNo = @"911234567890; //91-countrycode remaining are mobile number.

NSString *phoneNumber = [NSString stringWithFormat:@"tel:%@",phNo];

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:phoneNumber]];

Note: For iPad it won't work.

Swift:

let phoneNo = model.mobileNo

let newString:String = phoneNo.replacingOccurrences(of: " ", with: "")

let phoneUrl = URL(string: "telprompt:+91\(newString)")

if let callURL = phoneUrl {

     self.makeCall(callURL)

}

//makeCall function

func makeCall(_ phoneURL:URL) {

        if UIApplication.shared.canOpenURL(phoneURL) {

            UIApplication.shared.openURL(phoneURL)

        }

        else {

            let alertController = UIAlertController(title: "Warning!", message: "Not possible to make call", preferredStyle: .alert)

            let okAct = UIAlertAction(title: "OK", style: .default, handler: { (act) in

                print("OK")

            })

            alertController.addAction(okAct)

            self.present(alertController, animated: true, completion: nil)

        }

    }