如何使用项目选择创建 Iphone 警报？

Question

如何为 iPhone 创建这样的警报？

Answer 1

您必须自己创建一个这样的视图。

我能想到的最简单的方法是创建一个 UIView，然后以模态方式呈现它。

Answer 2

为了做同样的事情，你必须使用嵌入 UITableView 的自定义 UIAlertView。为此，this 或 this 将很好地指导您。

Answer 3

看看http://starterstep.wordpress.com/2009/03/24/custom-uialertview-with-uitableview/和http://starterstep.wordpress.com/2009/09/16/custom-uialertview-with-tableview-part-2/

Answer 4

在 iPhone 中，UIPickerView 与 UIActionSheet 的组合大多用于从用户那里获取输入，用户必须从多个选项中选择一个。

一个例子：

请参考this SO post 了解如何制作。

Answer 5

为此，您只需要创建视图——它由 uiview、tableview 和一个按钮组成。 CustomAlertView 的代码。

UIView-AlertAnimations.h                    // user defined class


@interface UIView(AlertAnimations)

- (void)doPopInAnimation;
- (void)doPopInAnimationWithDelegate:(id)animationDelegate;
- (void)doFadeInAnimation;
- (void)doFadeInAnimationWithDelegate:(id)animationDelegate;
@end

---

UIView-AlertAnimations.m

#import "UIView-AlertAnimations.h"
#import <"QuartzCore/QuartzCore.h">

#define kAnimationDuration  0.2555

@implementation UIView(AlertAnimations)
- (void)doPopInAnimation
{
    [self doPopInAnimationWithDelegate:nil];
}
- (void)doPopInAnimationWithDelegate:(id)animationDelegate
{
    CALayer *viewLayer = self.layer;
    CAKeyframeAnimation* popInAnimation =[CAKeyframeAnimation    
    animationWithKeyPath:@"transform.scale"];

popInAnimation.duration = kAnimationDuration;
popInAnimation.values = [NSArray arrayWithObjects:
                         [NSNumber numberWithFloat:0.6],
                         [NSNumber numberWithFloat:1.1],
                         [NSNumber numberWithFloat:.9],
                         [NSNumber numberWithFloat:1],
                         nil];
popInAnimation.keyTimes = [NSArray arrayWithObjects:
                           [NSNumber numberWithFloat:0.0],
                           [NSNumber numberWithFloat:0.6],
                           [NSNumber numberWithFloat:0.8],
                           [NSNumber numberWithFloat:1.0], 
                           nil];    
popInAnimation.delegate = animationDelegate;

[viewLayer addAnimation:popInAnimation forKey:@"transform.scale"];  
}

- (void)doFadeInAnimation
{
    [self doFadeInAnimationWithDelegate:nil];
}
- (void)doFadeInAnimationWithDelegate:(id)animationDelegate
{
    CALayer *viewLayer = self.layer;
    CABasicAnimation *fadeInAnimation = [CABasicAnimation 
                                            animationWithKeyPath:@"opacity"];
    fadeInAnimation.fromValue = [NSNumber numberWithFloat:0.0];
    fadeInAnimation.toValue = [NSNumber numberWithFloat:1.0];
    fadeInAnimation.duration = kAnimationDuration;
    fadeInAnimation.delegate = animationDelegate;
    [viewLayer addAnimation:fadeInAnimation forKey:@"opacity"];
}
@end



CustomAlertView.m

@implementation CustomAlertView

- (IBAction)show
{
// Retaining self is odd, but we do it to make this "fire and forget"
[self retain];

// We need to add it to the window, which we can get from the delegate
id appDelegate = [[UIApplication sharedApplication] delegate];
UIWindow *window = [appDelegate window];
[window addSubview:self.view];

// Make sure the alert covers the whole window
self.view.frame = window.frame;
self.view.center = window.center;

// "Pop in" animation for alert
[alertView doPopInAnimationWithDelegate:self];

// "Fade in" animation for background
[backgroundView doFadeInAnimation];
}

- (IBAction)dismiss:(id)sender
{
    [inputField resignFirstResponder];
    [UIView beginAnimations:nil context:nil];
    self.view.alpha = 0.0;
    [UIView commitAnimations];

    [self performSelector:@selector(alertDidFadeOut) withObject:nil afterDelay:0.5];



if (sender == self || [sender tag] == CustomAlertViewButtonTagOk)
    [delegate CustomAlertView:self wasDismissedWithValue:inputField.text];
else
{
    if ([delegate respondsToSelector:@selector(customAlertViewWasCancelled:)])
        [delegate customAlertViewWasCancelled:self];
} 

}

 - (void)alertDidFadeOut
{    
[self.view removeFromSuperview];
[self autorelease];
}

CAAnimation 委托方法

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
{
    [self.inputField becomeFirstResponder];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [self dismiss:self];
    return YES;
}
@end


- (IBAction)show
{
// Retaining self is odd, but we do it to make this "fire and forget"
[self retain];

// We need to add it to the window, which we can get from the delegate
id appDelegate = [[UIApplication sharedApplication] delegate];
UIWindow *window = [appDelegate window];
[window addSubview:self.view];

// Make sure the alert covers the whole window
self.view.frame = window.frame;
self.view.center = window.center;

// "Pop in" animation for alert
[alertView doPopInAnimationWithDelegate:self];

// "Fade in" animation for background
[backgroundView doFadeInAnimation];
}


- (IBAction)dismiss:(id)sender
{
[inputField resignFirstResponder];
[UIView beginAnimations:nil context:nil];
self.view.alpha = 0.0;
[UIView commitAnimations];

[self performSelector:@selector(alertDidFadeOut) withObject:nil afterDelay:0.5];

if (sender == self || [sender tag] == CustomAlertViewButtonTagOk)
    [delegate CustomAlertView:self wasDismissedWithValue:inputField.text];
else
{
    if ([delegate respondsToSelector:@selector(customAlertViewWasCancelled:)])
        [delegate customAlertViewWasCancelled:self];
} 
}


- (void)alertDidFadeOut
{    
    [self.view removeFromSuperview];
    [self autorelease];
}


- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
{
    [self.inputField becomeFirstResponder];
}

最后，我们实现了一种文本字段委托方法，以便当用户按下键盘上的返回键时，它会关闭对话框。

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [self dismiss:self];
    return YES;
}

至此，我们完成了。我们现在可以像使用 UIAlertView 一样使用这个自定义警报视图：

 CustomAlertView *alert = [[CustomAlertView alloc]init];
alert.delegate = self;
[alert show];
[alert release];

当然这对你有用。