Question

我从github获得了这个项目。

这是自定义AlertView。我明白它是如何工作的。为我的项目修改了它，比如

enter image description here

课程1 - 某些产品的名称和“1” - 是其金额。当我输入正/负数量增加/减少时。但它只适用于我的变量（我在这个AlertView上加载，当我显示它时，它是1）。如何通过更改var（金额）重新加载此警报视图的消息。我无法理解。这是我的代码。

在我班上，我通过此代码调用警报视图

BlockAlertView *alert = [BlockAlertView alertWithTitle: title message:ac.acCount];

[alert setCancelButtonWithTitle:@"-" block:nil];
[alert setDestructiveButtonWithTitle:@"+" block:^{
            int u = [ac.acCount intValue];
            u++;
            ac.acCount = [NSString stringWithFormat:@"%d", u];
            NSLog(@"%d", u);
        }];
        [alert addButtonWithTitle:@"Ok" block:^{
            NSMutableArray *container = [[NSMutableArray alloc] init];
            [container addObject:title];
            [container addObject:price];
            [container addObject:bId];
            [container addObject:ac.acCount];
            [container addObject:depid];
            [[NSNotificationCenter defaultCenter] postNotificationName:@"MyNotification" object:container];
        }];
        [alert show];

Show方法只绘制带有params的警报视图，它取自来自alertWithTitle：标题消息：ac.acCount。这是代码

+ (BlockAlertView *)alertWithTitle:(NSString *)title message:(NSString *)message
 {
    return [[[BlockAlertView alloc] initWithTitle:title message:message] autorelease];
 }

这是

- (id)initWithTitle:(NSString *)title message:(NSString *)message 
{
NSLog(@"title - %@ message - %@", title, message);

if ((self = [super init]))
{
    UIWindow *parentView = [BlockBackground sharedInstance];
    CGRect frame = parentView.bounds;
    frame.origin.x = floorf((frame.size.width - background.size.width) * 0.5);
    frame.size.width = background.size.width;

    _view = [[UIView alloc] initWithFrame:frame];
    _blocks = [[NSMutableArray alloc] init];
    _height = kAlertViewBorder + 6;

    if (title)
    {
        CGSize size = [title sizeWithFont:titleFont
                        constrainedToSize:CGSizeMake(frame.size.width-kAlertViewBorder*2, 1000)
                            lineBreakMode:UILineBreakModeWordWrap];

        UILabel *labelView = [[UILabel alloc] initWithFrame:CGRectMake(kAlertViewBorder, _height, frame.size.width-kAlertViewBorder*2, size.height)];
        labelView.font = titleFont;
        labelView.numberOfLines = 0;
        labelView.lineBreakMode = UILineBreakModeWordWrap;
        labelView.textColor = kAlertViewTitleTextColor;
        labelView.backgroundColor = [UIColor clearColor];
        labelView.textAlignment = UITextAlignmentCenter;
        labelView.shadowColor = kAlertViewTitleShadowColor;
        labelView.shadowOffset = kAlertViewTitleShadowOffset;
        labelView.text = title;
        [_view addSubview:labelView];
        [labelView release];

        _height += size.height + kAlertViewBorder;
    }

    if (message)
    {
        CGSize size = [message sizeWithFont:messageFont
                          constrainedToSize:CGSizeMake(frame.size.width-kAlertViewBorder*2, 1000)
                              lineBreakMode:UILineBreakModeWordWrap];

        UILabel *labelView = [[UILabel alloc] initWithFrame:CGRectMake(kAlertViewBorder, _height, frame.size.width-kAlertViewBorder*2, size.height)];
        labelView.font = messageFont;
        labelView.numberOfLines = 0;
        labelView.lineBreakMode = UILineBreakModeWordWrap;
        labelView.textColor = kAlertViewMessageTextColor;
        labelView.backgroundColor = [UIColor clearColor];
        labelView.textAlignment = UITextAlignmentCenter;
        labelView.shadowColor = kAlertViewMessageShadowColor;
        labelView.shadowOffset = kAlertViewMessageShadowOffset;
        labelView.text = message;
        [_view addSubview:labelView];
        [labelView release];

        _height += size.height + kAlertViewBorder;
    }

    _vignetteBackground = NO;
}

return self;

}

我试过用这样的东西

-(void)reloadAlertView: (NSString *) title: (NSString *) message{
[self initWithTitle:title message:message];
}

并从我的班级调用此处，我在其中显示警报视图。

[alert reloadAlertView: title: newMessage];

Answer 1

你需要在CustomAlertView.h中引用一个新标签

@property (nonatomic, strong) IBOutlet UILabel *mylab;

然后您可以通过CustomAlertView.h类的对象获取此标签的属性

BlockAlertView *alert ...;
alert.mylab.text = @"hello";

Answer 2

解决方案（简单，不需要破解BlockAlertView.m）只要点击+按钮，警报就会消失，然后重新出现。

<强> ViewController.m

@implementation ViewController {


        BlockAlertView *alert ;
        NSInteger value;
    }

    -(void) viewDidLoad {
      value = 0;


        [self reloadAlert];


    }


    -(void) reloadAlert {
        value += 1;


        __block ViewController* _self = self;
        alert = [[BlockAlertView alloc] initWithTitle:@"Course1" message:[[[NSNumber alloc] initWithInteger:value ] stringValue]];


        [alert setDestructiveButtonWithTitle:@"PLUS" block:^{

            [_self reloadAlert];


        }];
        [alert show];

    }
   }

解决方案，如果您希望保留AlertView，请不要弹出。

一个。修改BlockAlertView.h以便从messageLabelView访问ViewController以外的内容，以便我们稍后重新制作邮件。

<强> BlockAlertView.h

@interface BlockAlertView  { 
...
}
@property (nonatomic, retain) UILabel *messageLabelView;

如果愿意，您也可以将UIView *_view从@protected中移出@property。在这种情况下，messageLabelView可以通过_view的子视图访问

湾修改BlockAlertView.m dismissWithClickedButtonIndex:animated:，以便在removeView签名按钮 - buttonIndex == PLUS被硬编码为buttonIndex时停用0功能。

可能有更好的选择来停止PLUS按钮的块obj中的执行线程，但我不知道该怎么做：）

℃。在呈现消息标签期间修改BlockAlert.m initWithTitle:message:以将messageLabelView的引用添加到labelView。

<强> BlockAlertView.m

@synthesize messageLabelView;



     - (id)initWithTitle:(NSString *)title message:(NSString *)message 
    {
     ...
    // code to initialize messageLabelView
     if (message)
            {

               .... 
                // code to render labelView for message. add reference to messageLabelView
                 messageLabelView = labelView;
                  // [labelView release];


            }
    }

    - (void)dismissWithClickedButtonIndex:(NSInteger)buttonIndex animated:(BOOL)animated 
    {
        if (buttonIndex >= 0 && buttonIndex < [_blocks count])
        {
            id obj = [[_blocks objectAtIndex: buttonIndex] objectAtIndex:0];
            if (![obj isEqual:[NSNull null]])
            {
                ((void (^)())obj)();
            }
        }

    // there may be a better option to stop the execution thread inside the block obj above
        if(buttonIndex == 0) {// or whatever index of Plus Button, dont removeView
            return;
        }

    // code to removeView below, keep as usual
        if (animated)
        {
           ...
        }
        else
        {
        ....
        }
    }
}

d。在ViewController.m

<强> ViewController.m

-(void) reloadAlert {

    value += 1;

    alert.messageLabelView.text = [[[NSNumber alloc] initWithInteger:value ] stringValue];
    [alert.messageLabelView setNeedsDisplay];
}

如何重新加载UIAlertView消息

2 个答案: