Question

我在iOS应用程序中显示免责声明UIAlertView，但iOS中的默认AlertView大小非常小。我怎样才能把它做大？

看起来应该很简单，但从我搜索过的信息来看似乎没有办法做到这一点？

代码，

UIAlertView* alert = [[UIAlertView alloc] initWithTitle: @"Disclaimer" message: nil delegate: self cancelButtonTitle: @"Accept" otherButtonTitles: nil];

UIWebView* webView = [[UIWebView alloc] init];
[webView setFrame:CGRectMake(0, 0, 280, 140)];
[webView loadHTMLString: html baseURL: nil];
UIView* view = [[UIView alloc] initWithFrame: CGRectMake(0, 0, 280, 140)];
[view addSubview: webView];
[alert setValue: view forKey: @"accessoryView"];
[alert show];

Answer 1

首先，使用您的网络视图创建一个视图控制器，我们将其称为MyWebViewController。

然后您可以将其作为全屏控制器呈现：

MyWebViewController* alertController = [[MyWebViewController alloc] init];
alertController.view.backgroundColor = [UIColor.lightGrayColor colorWithAlphaComponent:0.2];
alertController.modalPresentationStyle = UIModalPresentationOverFullScreen;

[self presentViewController:alertController animated:YES completion:nil];

这是一个全屏控制器。您必须在中心为您的内容创建一个视图，为该视图添加边框并将所有内容保持为半透明。

您也可以使用popover：

UIView *sourceView = self.view;

MyWebViewController* alertController = [[MyWebViewController alloc] init];
alertController.modalPresentationStyle = UIModalPresentationPopover;

alertController.preferredContentSize = CGRectInset(self.view.bounds, 20, 100).size;
alertController.popoverPresentationController.canOverlapSourceViewRect = YES;
alertController.popoverPresentationController.sourceView = sourceView;
alertController.popoverPresentationController.sourceRect = CGRectMake(CGRectGetMidX(sourceView.bounds), CGRectGetMidY(sourceView.bounds), 0, 0);
alertController.popoverPresentationController.permittedArrowDirections = 0;
alertController.popoverPresentationController.delegate = self;

[self presentViewController:alertController animated:YES completion:nil];

代表还必须实施：

- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller traitCollection:(UITraitCollection *)traitCollection {
    return UIModalPresentationNone;
}

源视图通常是打开弹出窗口的按钮，但我使用父视图来确保弹出窗口居中。

您还必须添加由UIAlertView自动添加的按钮，但这应该是微不足道的。

Answer 2

您需要创建一个新类来完成此任务：

<强> WebAlertView.h

#import <UIKit/UIKit.h>

@interface WebAlertView : UIView

- (id)initWithTitle:(NSString *)title webView:(UIWebView *)webView delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle;

- (void)show;

@end

@protocol WebAlertViewDelegate <NSObject>
@optional

- (void)webAlertViewCancel:(WebAlertView *)alertView;

@end

<强> WebAlertView.m

#import "WebAlertView.h"

@interface WebAlertView()

@property (weak, nonatomic) UIWebView *webView;
@property (weak, nonatomic) NSString *title;
@property (weak, nonatomic) NSString *cancelButtonTitle;
@property (weak, nonatomic) id delegate;

@property (strong, nonatomic) UIView *curtainView;

@end

@implementation WebAlertView

- (id)initWithTitle:(NSString *)title webView:(UIWebView *)webView delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle {
    CGFloat titleViewHeight = 64.0;
    CGFloat cancelButtonHeight = 44.0;

    if ((self = [super initWithFrame:CGRectMake(0, 0, webView.frame.size.width, webView.frame.size.height+titleViewHeight+cancelButtonHeight)])) {

        self.backgroundColor = [UIColor groupTableViewBackgroundColor];

        _webView = webView;
        _title = title;
        _cancelButtonTitle = cancelButtonTitle;
        _delegate = delegate;

        CGRect titleViewFrame = self.frame;
        titleViewFrame.size.height = titleViewHeight;
        UILabel *label = [[UILabel alloc] initWithFrame:titleViewFrame];
        label.text = title;
        label.font = [UIFont boldSystemFontOfSize:16.0];
        label.textAlignment = NSTextAlignmentCenter;

        [self addSubview:label];

        CGRect webViewFrame = _webView.frame;
        webViewFrame.origin.y = titleViewHeight;
        _webView.frame = webViewFrame;

        [self addSubview:_webView];

        CGRect cancelButtonFrame = self.frame;
        cancelButtonFrame.size.height = cancelButtonHeight;
        cancelButtonFrame.origin.y = self.frame.size.height - cancelButtonHeight;
        UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
        button.frame = cancelButtonFrame;
        [button setTitle:cancelButtonTitle forState:UIControlStateNormal];
        button.titleLabel.font = [UIFont boldSystemFontOfSize:16.0];

        [button addTarget:self action:@selector(buttonTouchUpInside) forControlEvents:UIControlEventTouchUpInside];

        [self addSubview:button];
    }
    return self;
}

- (void)show {
    if ([_delegate isKindOfClass:[UIViewController class]]) {
        UIViewController *delegateViewController = (UIViewController *)_delegate;

        if (!_curtainView) {
            _curtainView = [[UIView alloc] initWithFrame:delegateViewController.view.bounds];
            _curtainView.backgroundColor = [UIColor blackColor];
            _curtainView.alpha = 0.5;
        }
        [delegateViewController.view addSubview:_curtainView];

        self.center = delegateViewController.view.center;

        [delegateViewController.view addSubview:self];
    }
}

- (void)drawRect:(CGRect)rect {

    self.layer.cornerRadius = 16.0;
    self.clipsToBounds = YES;
}

- (void)buttonTouchUpInside {

    [_curtainView removeFromSuperview];
    [self removeFromSuperview];

    if([_delegate respondsToSelector:@selector(webAlertViewCancel:)]) {
        [_delegate webAlertViewCancel:self];
    }
}

@end

使用方法：

UIWebView* webView = [[UIWebView alloc] init];
[webView setFrame:CGRectMake(0, 0, 280, 140)];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.google.com"]];
[webView loadRequest:urlRequest];

WebAlertView *webAlertView = [[WebAlertView alloc] initWithTitle:@"Disclaimer" webView:webView delegate:self cancelButtonTitle:@"Accept"];
[webAlertView show];

注意：

只有实施取消按钮 - 如果您愿意，应该知道如何实施其他按钮。
没有什么可以阻止你使WebAlertView比超级视图更大，所以请记住这一点。还没有考虑标题长度或cancelButton字符串。
正如其他人所说，UIAlertView已被弃用。
如果你想使用ViewController，Sulthan给出了一个很好的答案。如果你真的想要像UIAlertView这样的东西，我的答案可能会更好。

Answer 3

根据Apple Documentation，UIAlertView类旨在按原样使用，不支持子类化。此类的视图层次结构是私有的，不得修改。

要自定义尺寸，请使用JSSAlertView代替UIAlertView

Answer 4

使用 NSLayoutConstraint 并固定大小的 UIAlertController 高度和宽度。

下面是代码：

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"abcd" message:@"edfg" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *action = [UIAlertAction actionWithTitle:@"Done" style:UIAlertActionStyleDefault handler:nil];
[alert addAction:action];
NSLayoutConstraint *height = [NSLayoutConstraint constraintWithItem:alert.view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:self.view.frame.size.height * 0.8];
NSLayoutConstraint *width = [NSLayoutConstraint constraintWithItem:alert.view attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeWidth  multiplier:1 constant:self.view.frame.size.width * 0.5];
[alert.view addConstraint:width];
[alert.view addConstraint:height];
[alert.view setBackgroundColor:[UIColor blackColor]];
[self presentViewController:alert animated:YES completion:nil];

但 UIAlertController 的宽度是固定的。使用 NSLayoutConstraint UIAlertController的宽度未更改。

Answer 5

你不应该这样做，但是有一个黑客可以扩展整个UIAlertView。 UIAlertView始终显示在新窗口中，诀窍是缩放窗口。

[alert show]
alert.window.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.3, 1.3); // Must be called after [alert show]

Answer 6

试试这个方法---->

制作自定义警报视图
增加警报视图高度

Increase Alert View Height

Answer 7

UIAlertView在iOS 9.0中已弃用。您需要开始使用UIAlertController。据我所知，我们可以增加UIAlertController的大小。我已经尝试了所有方法。

Answer 8

您必须由自己的第三方创建自定义视图：因为在UIAlertView和UIAlertController框架调整不起作用。

如何在iOS中使UIAlertView更大？

8 个答案: