如何在iOS 8中设置UIAlertController的高度和宽度 [英] How to set height and width of a UIAlertController in IOS 8

问题描述

我有一个带有文本文件的UIAlertController. 问题在于默认的UIAlertController的尺寸非常小.它的文字无法正确显示.

I have a UIAlertController with an TextFile. The problem is that the default UIAlertController is a very small size. It's text cannot be seen properly.

因此，我想增加UIAlertController的高度和宽度.换句话说，我想创建一个自定义UIAlertController.这样做的方式是什么?

So, I want to increase the height and width of the UIAlertController. In other words, I want to create a custom UIAlertController. What would be the way to do that?

推荐答案

我认为您不能设置大小.坏的解决方法是在邮件上设置\n. UIAlertView也有相同的限制.

I do not think you can set the size. Bad workaround is, to set \n on the message. UIAlertView also has same limitation.

我将建议使用UIPopoverController并实现您自己的dismiss按钮，因为UIAlertController的目的更多是根据Apple文档向用户显示警报消息(短消息).我认为消息墙不可以视为警报消息.

I will suggest to use UIPopoverController and implement your own dismiss button, since UIAlertController's purpose is more to display alert messages to the user (short message) per Apple Documentation. I do not think wall of message can be considered as alert message.

通常，我认为Apple设置了此限制，以提醒用户该视图是向用户显示短消息作为其UX的一部分.

Generally, I think this limitation is set by Apple as a reminder this view is to display short message to users as part of their UX.

使用示例代码编辑 首先，对不起，我的意思是UIPopoverPresentViewController，而不是UIPopoverController

Edited with sample code First, sorry, I mean UIPopoverPresentViewController, not UIPopoverController

这是示例类:

@interface DemoPopOverPresentViewController : UIViewController

- (instancetype)initWithTitle:(NSString*)title message:(NSString*)message buttonTitle:(NSString*)buttonTitle;

@property NSString* titleText;
@property NSString* messageText;
@property NSString* buttonTitleText;

@property UILabel* titleLabel;
@property UILabel* textLabel;
@property UIButton* submitButton;

@end

@implementation DemoPopOverPresentViewController

- (instancetype)initWithTitle:(NSString*)title message:(NSString*)message buttonTitle:(NSString*)buttonTitle;
{
    self = [super init];

    if ( self ) {
        _titleText = title;
        _messageText = message;
        _buttonTitleText = buttonTitle;
    }

    return self;
}

- (void)viewDidLoad;
{
    [super viewDidLoad];

    _titleLabel = [UILabel new];
    [_titleLabel setTextAlignment:NSTextAlignmentCenter];
    [_titleLabel setFont:[UIFont preferredFontForTextStyle:UIFontTextStyleHeadline]];
    [_titleLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
    [_titleLabel setText:_titleText];
    [self.view addSubview:_titleLabel];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|[_titleLabel]|"     options:0 metrics:nil views:NSDictionaryOfVariableBindings(_titleLabel)]];

    _textLabel = [UILabel new];
    [_textLabel setTextAlignment:NSTextAlignmentCenter];
    [_textLabel setFont:[UIFont preferredFontForTextStyle:UIFontTextStyleBody]];
    [_textLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
    [_textLabel setNumberOfLines:0];
    [_textLabel setText:_messageText];
    [self.view addSubview:_textLabel];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|[_textLabel]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(_textLabel)]];

    _submitButton = [UIButton buttonWithType:UIButtonTypeSystem];
    [_submitButton setTitle:_buttonTitleText forState:UIControlStateNormal];
    [_submitButton addTarget:self action:@selector(submitButtonTouched:) forControlEvents:UIControlEventTouchUpInside];
    [_submitButton setTranslatesAutoresizingMaskIntoConstraints:NO];
    [self.view addSubview:_submitButton];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|[_submitButton]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(_submitButton)]];

    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[_titleLabel(<=44.0)]-16-[_textLabel]-16-[_submitButton(<=44.0)]-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(_titleLabel,_textLabel,_submitButton)]];
}

- (void)submitButtonTouched:(id)sender;
{
    [self dismissViewControllerAnimated:YES completion:^{

    }];
}

@end

然后在presentingViewController上，

Then on presentingViewController,

• 首先，它将需要实现UIPopoverPresentationControllerDelegate委托

• 然后初始化该类:

• first, it will need to implement UIPopoverPresentationControllerDelegate delegate

• then to initialise the class:

DemoPopOverPresentViewController* controller = [[DemoPopOverPresentViewController alloc] initWithTitle:@"Info" message:@"The quick brown fox jumps over the lazy dog" buttonTitle:@"Dismiss"];
controller.modalPresentationStyle = UIModalPresentationPopover;
// set the content size of your 'alert view'
controller.preferredContentSize = CGSizeMake(200.0, 150.0);
UIPopoverPresentationController* pc = [controller popoverPresentationController];
pc.sourceView = self.view;
pc.delegate = self;
pc.sourceRect = CGRectMake(self.view.frame.size.width/2.0, self.view.frame.size.height/2.0, 0.0, 0.0);
pc.permittedArrowDirections = NULL;
[self presentViewController:controller animated:YES completion:^{

}];

UIPopoverPresentationControllerDelegate的实现委托方法:- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller并返回UIModalPresentationNone

implement delegate method for UIPopoverPresentationControllerDelegate: - (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller and return UIModalPresentationNone

这篇关于如何在iOS 8中设置UIAlertController的高度和宽度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！