我们如何在使用自动布局的for循环的帮助下创建UIlabels？

Question

在我的项目中，我正在使用自动布局，我在视图控制器上添加了一个或多个标签，为此，我想使用＆＃34; for＆＃34;通过代码减少目的循环，但使用＆＃34; constraintWithVisualFormate＆＃34;。

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]];
}

我正在靠近for循环，因为我不明白我们如何在for循环中插入nameTextField，emailTextField ... etc标签。

Answer 1

截图

代码

Var myVar = [<the T type>]()
uniq(<some source>, uniqueTitle: &myVar)

func uniq<S : SequenceType, T : Hashable where S.Generator.Element == T>(source: S) -> [T] {
            var buffer = [T]()
            var added = Set<T>()
            for elem in source {
                if !added.contains(elem) {
                    buffer.append(elem)
                    added.insert(elem)

                }
            }
            return buffer
        }
        //titleatcell is an array with repeating objects.
        titleatcell.append(title!)
        var uniqueTitle = uniq(titleatcell)
        uniqueTitle.append(title!)
        print(uniqueTitle)

     //return count of objects in array
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell = table.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) 

    //Error: uniqueTitle is not declared. 
    cell.textLabel?.text = uniqueTitle[indexPath.row]
    return cell
}

这是功能

 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]];