本文介绍了如何以编程方式使用约束？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在努力的应用程序，将只工作在水平和做一切程序。
我有一个imageview，两个文本字段和两个按钮，但我不知道如何设置这些文本字段和按钮的约束，意味着当我在iPhone 5s那么很好，但是当我使用iPhone 6s加，那么它看起来很小。
我在这里发布一些代码和截图
UIImageView * logoImage = [[UIImageView alloc] init];
logoImage.frame = CGRectMake（CGRectGetMidX（self.view.frame）-100，10，250，100）;
[logoImage setImage：[UIImage imageNamed：@antya_logo1.png]];
[self.view addSubview：logoImage];
UILabel * loginLabel = [[UILabel alloc] init];
loginLabel.frame = CGRectMake（10，0，100，40）;
loginLabel.text = @登录表单;
loginLabel.textColor = [UIColor BlackColor];
loginLabel.font = [UIFont fontWithName：@LaoSangamMNsize：18];
CGFloat Xuser = CGRectGetMidX（self.view.frame）-120;
CGFloat Yuser = CGRectGetMaxY（loginLabel.frame）+80;
usernameField = [[UITextField alloc] init];
usernameField.frame = CGRectMake（Xuser，Yuser，300，35）;
usernameField.placeholder = @User Name;
usernameField.font = [UIFont fontWithName：@LaoSangamMNsize：18];
usernameField.backgroundColor = [UIColor whiteColor];
usernameField.layer.cornerRadius = 7;
usernameField.layer.borderWidth = 0.5;
[self.view addSubview：usernameField];
UIImageView * userImgV = [[UIImageView alloc] init];
userImgV.frame = CGRectMake（CGRectGetMinX（usernameField.frame）-35，CGRectGetMinY（usernameField.frame）+5，25，25）;
[userImgV setImage：[UIImage imageNamed：@user-icon.png]];
[self.view addSubview：userImgV];
CGFloat Ypass = CGRectGetMaxY（usernameField.frame）+20;
passwordField = [[UITextField alloc] init];
passwordField.frame = CGRectMake（Xuser，Ypass，300，35）;
passwordField.placeholder = @Password;
passwordField.secureTextEntry = YES;
passwordField.font = [UIFont fontWithName：@LaoSangamMNsize：18];
passwordField.backgroundColor = [UIColor whiteColor];
passwordField.layer.cornerRadius = 7;
passwordField.layer.borderWidth = 0.5;
[self.view addSubview：passwordField];
这是在i手机6s加
请帮助我，提前感谢
解决方案
你正在处理的自动布局设置框架的视图是不工作。您需要为所有iPhone设备正确设置该视图的约束。
UIImageView * logoImage = [[UIImageView alloc] init ];
[logoImage setImage：[UIImage imageNamed：@antya_logo1.png]];
logoImage.translatesAutoresizingMaskIntoConstraints = false;
[self.view addSubview：logoImage];
UILabel * loginLabel = [[UILabel alloc] init];
loginLabel.text = @登录表单;
loginLabel.textColor = [UIColor blackColor];
loginLabel.font = [UIFont fontWithName：@LaoSangamMNsize：18];
loginLabel.translatesAutoresizingMaskIntoConstraints = false;
[self.view addSubview：loginLabel];
UITextField * usernameField = [[UITextField alloc] init];
usernameField.placeholder = @User Name;
usernameField.font = [UIFont fontWithName：@LaoSangamMNsize：18];
usernameField.backgroundColor = [UIColor whiteColor];
usernameField.layer.cornerRadius = 7;
usernameField.layer.borderWidth = 0.5;
usernameField.translatesAutoresizingMaskIntoConstraints = false;
UIImageView * userImgV = [[UIImageView alloc] init];
[userImgV setImage：[UIImage imageNamed：@user-icon.png]];
//设置textfield的左视图
usernameField.leftView = userImgV;
usernameField.leftViewMode = UITextFieldViewModeAlways;
[self.view addSubview：usernameField];
UITextField * passwordField = [[UITextField alloc] init];
passwordField.placeholder = @Password;
passwordField.secureTextEntry = YES;
passwordField.font = [UIFont fontWithName：@LaoSangamMNsize：18];
passwordField.backgroundColor = [UIColor whiteColor];
passwordField.layer.cornerRadius = 7;
passwordField.layer.borderWidth = 0.5;
passwordField.translatesAutoresizingMaskIntoConstraints = false;
//设置textfield的左视图
UIImageView * passwordImgV = [[UIImageView alloc] init];
[passwordImgV setImage：[UIImage imageNamed：@password-icon.png]];
passwordField.leftView = passwordImgV;
passwordField.leftViewMode = UITextFieldViewModeAlways;
[self.view addSubview：passwordField];
UIButton * buttonSignUp = [UIButton buttonWithType：UIButtonTypeCustom];
[buttonSignUp setTag：101];
[buttonSignUp setTitle：@SIGNUPforState：UIControlStateNormal];
[buttonSignUp addTarget：self action：@selector（< your selector>）forControlEvents：UIControlEventTouchUpInside];
buttonSignUp.translatesAutoresizingMaskIntoConstraints = false;
[self.view addSubview：buttonSignUp];
UIButton * buttonFP = [UIButton buttonWithType：UIButtonTypeCustom];
[buttonFP setTag：101];
[buttonFP setTitle：@SIGNUPforState：UIControlStateNormal];
[buttonFP addTarget：self action：@selector（< your selector>）forControlEvents：UIControlEventTouchUpInside];
buttonFP.translatesAutoresizingMaskIntoConstraints = false;
[self.view addSubview：buttonFP];
//设置约束
// logoImage
//领先
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：logoImage attribute：NSLayoutAttributeLeading relatedBy： NSLayoutRelationEqual toItem：self.view attribute：NSLayoutAttributeLeading multiplier：1.0 constant：10]];
// top
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：logoImage attribute：NSLayoutAttributeTop relatedBy：NSLayoutRelationEqual toItem：self.view attribute：NSLayoutAttributeTop multiplier：1.0 constant：10]
// traling
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：self.view attribute：NSLayoutAttributeTrailing relatedBy：NSLayoutRelationEqual toItem：logoImage attribute：NSLayoutAttributeTrailing multiplier：1.0 constant：10]
// usernameField
// leading
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：usernameField attribute：NSLayoutAttributeLeading relatedBy：NSLayoutRelationEqual toItem：self.view attribute： NSLayoutAttributeLeading multiplier：1.0 constant：10]];
// traling
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：self.view attribute：NSLayoutAttributeTrailing relatedBy：NSLayoutRelationEqual toItem：usernameField attribute：NSLayoutAttributeTrailing multiplier：1.0 constant：10]
// top
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：logoImage attribute：NSLayoutAttributeBottom relatedBy：NSLayoutRelationEqual toItem：usernameField attribute：NSLayoutAttributeTop multiplier：1.0 constant：10]
// passwordField
// leading
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：passwordField attribute：NSLayoutAttributeLeading relatedBy：NSLayoutRelationEqual toItem：self.view attribute：NSLayoutAttributeLeading multiplier：1.0常数：10]];
// traling
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：self.view attribute：NSLayoutAttributeTrailing relatedBy：NSLayoutRelationEqual toItem：passwordField attribute：NSLayoutAttributeTrailing multiplier：1.0 constant：10]
// top
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：passwordField attribute：NSLayoutAttributeBottom relatedBy：NSLayoutRelationEqual toItem：passwordField attribute：NSLayoutAttributeTop multiplier：1.0 constant：10]
// buttonSignUp和buttonFP
//为buttonSignUp
导致[self.view addConstraint：[NSLayoutConstraint constraintWithItem：buttonSignUp attribute：NSLayoutAttributeLeading relatedBy： NSLayoutRelationEqual toItem：self.view attribute：NSLayoutAttributeLeading multiplier：1.0 constant：10]];
// traling for buttonFP
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：self.view attribute：NSLayoutAttributeTrailing relatedBy：NSLayoutRelationEqual toItem：buttonFP attribute：NSLayoutAttributeTrailing multiplier：1.0 constant：10] ;
//等于
的宽度[self.view addConstraint：[NSLayoutConstraint constraintWithItem：buttonFP attribute：NSLayoutAttributeWidth relatedBy：NSLayoutRelationEqual toItem：buttonSignUp attribute：NSLayoutAttributeWidth multiplier：1.0 constant：0]];
// btns之间的空格
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：buttonFP attribute：NSLayoutAttributeLeft relatedBy：NSLayoutRelationEqual toItem：buttonSignUp attribute：NSLayoutAttributeRight multiplier：1.0 constant：10]
//
的顶部[self.view addConstraint：[NSLayoutConstraint constraintWithItem：buttonSignUp attribute：NSLayoutAttributeBottom relatedBy：NSLayoutRelationEqual toItem：passwordField attribute：NSLayoutAttributeTop multiplier：1.0 constant：10]];
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：buttonFP attribute：NSLayoutAttributeBottom relatedBy：NSLayoutRelationEqual toItem：passwordField attribute：NSLayoutAttributeTop multiplier：1.0 constant：10]];
// bottom
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：self.view attribute：NSLayoutAttributeBottom relatedBy：NSLayoutRelationEqual toItem：buttonFP attribute：NSLayoutAttributeBottom multiplier：1.0 constant：10]
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：self.view attribute：NSLayoutAttributeBottom relatedBy：NSLayoutRelationEqual toItem：buttonSignUp attribute：NSLayoutAttributeBottom multiplier：1.0 constant：10]];
I am working on application which will work only horizontally and doing everything programmatically.
I am having a imageview, two textfield and two buttons but I don't know how to set constraints on these textfields and buttons, means when I am using in iPhone 5s then it is fine but when I am using iPhone 6s plus then it looks small.I am posting here some code and screenshots
UIImageView *logoImage = [[UIImageView alloc]init];
logoImage.frame = CGRectMake(CGRectGetMidX(self.view.frame)-100, 10, 250, 100);
[logoImage setImage:[UIImage imageNamed:@"antya_logo1.png"]];
[self.view addSubview:logoImage];
UILabel *loginLabel = [[UILabel alloc]init];
loginLabel.frame = CGRectMake(10, 0, 100, 40);
loginLabel.text = @"Login Form";
loginLabel.textColor = [UIColor blackColor];
loginLabel.font = [UIFont fontWithName:@"LaoSangamMN" size:18];
CGFloat Xuser = CGRectGetMidX(self.view.frame)-120;
CGFloat Yuser = CGRectGetMaxY(loginLabel.frame)+80;
usernameField = [[UITextField alloc]init];
usernameField.frame = CGRectMake(Xuser, Yuser, 300, 35);
usernameField.placeholder = @" User Name";
usernameField.font = [UIFont fontWithName:@"LaoSangamMN" size:18];
usernameField.backgroundColor = [UIColor whiteColor];
usernameField.layer.cornerRadius = 7;
usernameField.layer.borderWidth = 0.5;
[self.view addSubview:usernameField];
UIImageView *userImgV = [[UIImageView alloc]init];
userImgV.frame = CGRectMake(CGRectGetMinX(usernameField.frame)-35, CGRectGetMinY(usernameField.frame)+5, 25, 25);
[userImgV setImage:[UIImage imageNamed:@"user-icon.png"]];
[self.view addSubview:userImgV];
CGFloat Ypass = CGRectGetMaxY(usernameField.frame)+20;
passwordField = [[UITextField alloc]init];
passwordField.frame = CGRectMake(Xuser, Ypass, 300, 35);
passwordField.placeholder = @" Password";
passwordField.secureTextEntry = YES;
passwordField.font = [UIFont fontWithName:@"LaoSangamMN" size:18];
passwordField.backgroundColor = [UIColor whiteColor];
passwordField.layer.cornerRadius = 7;
passwordField.layer.borderWidth = 0.5;
[self.view addSubview:passwordField];
this is in i phone 6s plus
and this is in i phone5s
Please help me,thanks in advance
解决方案
Note : When you are dealing with autolayout setting frame of a view is not going to work. You need to set constraints for that view to look correctly in all iPhone devices.
UIImageView *logoImage = [[UIImageView alloc] init];
[logoImage setImage:[UIImage imageNamed:@"antya_logo1.png"]];
logoImage.translatesAutoresizingMaskIntoConstraints = false;
[self.view addSubview:logoImage];
UILabel *loginLabel = [[UILabel alloc]init];
loginLabel.text = @"Login Form";
loginLabel.textColor = [UIColor blackColor];
loginLabel.font = [UIFont fontWithName:@"LaoSangamMN" size:18];
loginLabel.translatesAutoresizingMaskIntoConstraints = false;
[self.view addSubview:loginLabel];
UITextField *usernameField = [[UITextField alloc]init];
usernameField.placeholder = @" User Name";
usernameField.font = [UIFont fontWithName:@"LaoSangamMN" size:18];
usernameField.backgroundColor = [UIColor whiteColor];
usernameField.layer.cornerRadius = 7;
usernameField.layer.borderWidth = 0.5;
usernameField.translatesAutoresizingMaskIntoConstraints = false;
UIImageView *userImgV = [[UIImageView alloc]init];
[userImgV setImage:[UIImage imageNamed:@"user-icon.png"]];
//set left view of textfield
usernameField.leftView = userImgV;
usernameField.leftViewMode = UITextFieldViewModeAlways;
[self.view addSubview:usernameField];
UITextField *passwordField = [[UITextField alloc]init];
passwordField.placeholder = @" Password";
passwordField.secureTextEntry = YES;
passwordField.font = [UIFont fontWithName:@"LaoSangamMN" size:18];
passwordField.backgroundColor = [UIColor whiteColor];
passwordField.layer.cornerRadius = 7;
passwordField.layer.borderWidth = 0.5;
passwordField.translatesAutoresizingMaskIntoConstraints = false;
//set left view of textfield
UIImageView *passwordImgV = [[UIImageView alloc]init];
[passwordImgV setImage:[UIImage imageNamed:@"password-icon.png"]];
passwordField.leftView = passwordImgV;
passwordField.leftViewMode = UITextFieldViewModeAlways;
[self.view addSubview:passwordField];
UIButton *buttonSignUp = [UIButton buttonWithType:UIButtonTypeCustom];
[buttonSignUp setTag:101];
[buttonSignUp setTitle:@"SIGNUP" forState:UIControlStateNormal];
[buttonSignUp addTarget:self action:@selector(<your selector>) forControlEvents:UIControlEventTouchUpInside];
buttonSignUp.translatesAutoresizingMaskIntoConstraints = false;
[self.view addSubview:buttonSignUp];
UIButton *buttonFP = [UIButton buttonWithType:UIButtonTypeCustom];
[buttonFP setTag:101];
[buttonFP setTitle:@"SIGNUP" forState:UIControlStateNormal];
[buttonFP addTarget:self action:@selector(<your selector>) forControlEvents:UIControlEventTouchUpInside];
buttonFP.translatesAutoresizingMaskIntoConstraints = false;
[self.view addSubview:buttonFP];
//setting constraints
//logoImage
//leading
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:logoImage attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeading multiplier:1.0 constant:10]];
//Top
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:logoImage attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeTop multiplier:1.0 constant:10]];
//traling
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:logoImage attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:10]];
// usernameField
//leading
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:usernameField attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeading multiplier:1.0 constant:10]];
//traling
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:usernameField attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:10]];
//top
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:logoImage attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:usernameField attribute:NSLayoutAttributeTop multiplier:1.0 constant:10]];
//passwordField
//leading
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:passwordField attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeading multiplier:1.0 constant:10]];
//traling
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:passwordField attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:10]];
//top
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:passwordField attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:passwordField attribute:NSLayoutAttributeTop multiplier:1.0 constant:10]];
//buttonSignUp and buttonFP
//leading for buttonSignUp
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:buttonSignUp attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeading multiplier:1.0 constant:10]];
//traling for buttonFP
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:buttonFP attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:10]];
//equal width for both
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:buttonFP attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:buttonSignUp attribute:NSLayoutAttributeWidth multiplier:1.0 constant:0]];
//space between both btns
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:buttonFP attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:buttonSignUp attribute:NSLayoutAttributeRight multiplier:1.0 constant:10]];
//top for both
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:buttonSignUp attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:passwordField attribute:NSLayoutAttributeTop multiplier:1.0 constant:10]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:buttonFP attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:passwordField attribute:NSLayoutAttributeTop multiplier:1.0 constant:10]];
//bottom
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:buttonFP attribute:NSLayoutAttributeBottom multiplier:1.0 constant:10]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:buttonSignUp attribute:NSLayoutAttributeBottom multiplier:1.0 constant:10]];
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