ios - 我们如何使用自动布局在 for 循环的帮助下创建 UIlabel？

Question

在我的项目中，我使用了自动布局，并且在我的 View Controller 上添加了一个或多个标签，为此我想通过代码减少目的使用“for”循环，但使用“constraintWithVisualFormate”。

我不明白!

如何使用 for 循环？

我的代码:

emailTextField = [[UILabel alloc] init];
emailTextField.text = @"MD (Medician)";
emailTextField.textColor = [UIColor blackColor];
emailTextField.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview: emailTextField];

nameTextField = [[UILabel alloc] init];
nameTextField.text = @"Experience:12 Years";
nameTextField.textColor = [UIColor blackColor];
nameTextField.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview: nameTextField];

password = [[UILabel alloc] init];
password.text = @"Experience:12 Years";
password.textColor = [UIColor blackColor];
password.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview: password];


//Applying auto-layouts for labels

NSDictionary * views = NSDictionaryOfVariableBindings(emailTextField,nameTextField,password);

NSArray *textFields = @[emailTextField, nameTextField, password];

for (UITextField *textField in textFields) {

   [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[textField]-10-|"
                                                                     options:0
                                                                     metrics:nil
                                                                       views:viewsDic]];
}

我在 for 循环上方挣扎，因为我不明白我们如何在 for 循环中插入 nameTextField、emailTextField...等标签。

Answer 1

截图

代码

 emailTextField = [self createLabelWithText: @"MD (Medician)"];
[self.view addSubview: emailTextField];

nameTextField = [self createLabelWithText: @"Experience:12 Years"];
[self.view addSubview: nameTextField];

passwword = [self createLabelWithText: @"Experience:12 Years"];
[self.view addSubview: passwword];

NSDictionary * viewsDic = NSDictionaryOfVariableBindings(emailTextField,nameTextField,passwword);

NSArray * keys = @[@"emailTextField",@"nameTextField",@"passwword"];

for (NSString * key in keys) {
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"H:|-10-[%@]-10-|",key]
                                                                      options:0
                                                                      metrics:nil
                                                                        views:viewsDic]];
}
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-20-[emailTextField]-[nameTextField]-[passwword]"
                                                                  options:0
                                                                  metrics:nil
                                                                    views:viewsDic]];

这是函数

-(UILabel *)createLabelWithText:(NSString *)text{
    UILabel * label = [[UILabel alloc] init];
    label.text = text;
    label.textColor = [UIColor blackColor];
    label.translatesAutoresizingMaskIntoConstraints = NO;
    return label;
}