ios - 如何在 ios 中使用自动布局更改 ScrollView 内容大小

Question

我在 ScrollView 上添加 3 个 UITextfields 和 1 个 UIButton。

我的主要要求是当我单击 UITextfield 滚动时，必须向上滚动到键盘上方用户可见的所有字段。

当我单击键盘滚动上的返回按钮时，默认情况下必须滚动使用自动布局为 ScrollView contentSize 设置的内容。

我的代码:

@interface ViewController10 ()
{
    UIScrollView * scrollView;
    UITextField * emailTextField;
    UITextField * nameTextField;
    UITextField * passwword;
    UIButton * submit;
}

@end

@implementation ViewController10

- (void)viewDidLoad {
    [super viewDidLoad];

    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];

    NSDictionary * 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]];
    }

    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-30-[emailTextField(30)]-130-[nameTextField(30)]-130-[passwword(30)]-60-[submit(30)]-20-|"
                                                                      options:0
                                                                      metrics:nil
                                                                        views:viewsDic]];

}

-(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];

    return YES;
}

Answer 1

请查看这个很棒的教程，它对您绝对有帮助。

**

Using UIScrollView with Auto Layout in iOS

**

正如博客中所说，当您使用自动布局时，您需要以这种方式设置约束。

NSLayoutConstraint *leftConstraint = [NSLayoutConstraint constraintWithItem:self.contentView
                                                                  attribute:NSLayoutAttributeLeading
                                                                  relatedBy:0
                                                                     toItem:self.view
                                                                  attribute:NSLayoutAttributeLeft
                                                                 multiplier:1.0
                                                                   constant:0];
[self.view addConstraint:leftConstraint];

NSLayoutConstraint *rightConstraint = [NSLayoutConstraint constraintWithItem:self.contentView
                                                                   attribute:NSLayoutAttributeTrailing
                                                                   relatedBy:0
                                                                      toItem:self.view
                                                                   attribute:NSLayoutAttributeRight
                                                                  multiplier:1.0
                                                                    constant:0];
[self.view addConstraint:rightConstraint];

根据您的要求更改值和名称。