How can we reduce code using Autolayouts in ios - ios

Question

Hi i am beginner for auto-layouts and i am inserting "3" textfields and "1" button on scrollview
Here my requirement is according i-phone inches "Top space" must be Adjusting and when i click textfield all fields must be scrolling above keyboard and when i click "return" button in keyboard then scroll must be scrolling as like previous
For this i have tried below code but that is too length code can anybody explain me this concept using short process
my code:-
#import "ViewController10.h"
#interface ViewController10 ()
{
UIScrollView * scrollView;
UITextField * emailTextField;
UITextField * nameTextField;
UITextField * passwword;
UIButton * submit;
NSDictionary * viewsDic;
NSArray * verticalConstraints;
int height;
}
#end
#implementation ViewController10
- (void)viewDidLoad {
[super viewDidLoad];
height = [UIScreen mainScreen].bounds.size.height;
scrollView = [[UIScrollView alloc] init];
scrollView.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:scrollView];
emailTextField = [self createLabelWithText];
emailTextField.delegate = self;
[scrollView addSubview: emailTextField];
nameTextField = [self createLabelWithText];
nameTextField.delegate = self;
[scrollView addSubview: nameTextField];
passwword = [self createLabelWithText];
passwword.delegate = self;
[scrollView addSubview: passwword];
submit = [[UIButton alloc]init];
submit.backgroundColor = [UIColor orangeColor];
[submit setTitle: #"Submit" forState: UIControlStateNormal];
submit.translatesAutoresizingMaskIntoConstraints = NO;
[scrollView addSubview:submit];
viewsDic = NSDictionaryOfVariableBindings(scrollView,emailTextField,nameTextField,passwword,submit);
//Applying autolayouts for scrolview
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:#"H:|-0-[scrollView]-0-|"]
options:0
metrics:nil
views:viewsDic]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:#"V:|-0-[scrollView]-0-|"]
options:0
metrics:nil
views:viewsDic]];
//Applying autolayouts for textfields and button
[scrollView addConstraint:[NSLayoutConstraint constraintWithItem:emailTextField
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual
toItem:scrollView
attribute:NSLayoutAttributeCenterX
multiplier:1
constant:0]];
NSArray * keys = #[#"emailTextField",#"nameTextField",#"passwword",#"submit"];
for (NSString * key in keys) {
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:#"H:|-10-[%#]-10-|",key]
options:0
metrics:nil
views:viewsDic]];
}
if (height == 480.0) {
verticalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:#"V:|-30-[emailTextField(30)]-130-[nameTextField(30)]-130-[passwword(30)]-60-[submit(30)]-20-|"
options:0
metrics:nil
views:viewsDic];
}
else if (height == 568.0){
verticalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:#"V:|-50-[emailTextField(30)]-130-[nameTextField(30)]-130-[passwword(30)]-60-[submit(30)]-20-|"
options:0
metrics:nil
views:viewsDic];
}
else if(height == 667.0){
verticalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:#"V:|-80-[emailTextField(30)]-130-[nameTextField(30)]-130-[passwword(30)]-60-[submit(30)]-20-|"
options:0
metrics:nil
views:viewsDic];
}
[scrollView addConstraints:verticalConstraints];
}
-(UITextField *)createLabelWithText{
UITextField * textfield = [[UITextField alloc] init];
textfield.textColor = [UIColor whiteColor];
textfield.backgroundColor = [UIColor lightGrayColor];
textfield.translatesAutoresizingMaskIntoConstraints = NO;
return textfield;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField{
scrollView.contentSize = CGSizeMake(320, 700);
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
[textField resignFirstResponder];
[scrollView removeConstraints:verticalConstraints];
if (height == 480.0) {
verticalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:#"V:|-30-[emailTextField(30)]-130-[nameTextField(30)]-130-[passwword(30)]-60-[submit(30)]-20-|"
options:0
metrics:nil
views:viewsDic];
}
else if (height == 568.0){
verticalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:#"V:|-50-[emailTextField(30)]-130-[nameTextField(30)]-130-[passwword(30)]-60-[submit(30)]-20-|"
options:0
metrics:nil
views:viewsDic];
}
else if(height == 667.0){
verticalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:#"V:|-80-[emailTextField(30)]-130-[nameTextField(30)]-130-[passwword(30)]-60-[submit(30)]-20-|"
options:0
metrics:nil
views:viewsDic];
}
[scrollView addConstraints:verticalConstraints];
return YES;
}
#end

Answer 1

try masonry,it can reduce the code and it is easier for you to maintain and understand
https://github.com/SnapKit/Masonry