故事板中多个弹出框的最佳模式

Question

我正在编写一个iPad应用程序，该应用程序将具有多个按钮，单击这些按钮可打开一个弹出框，以显示一个表格视图。 用户将选择一个值，弹出菜单将被关闭，并且按钮的标题不会更改。

我使用一个Popover进行了此操作，然后又想添加另一个。 我想编写一些很好的，干净的可重用代码。

我最大的麻烦是与代表们在一起。 应该有几个？ 每个弹出窗口都应该有自己的窗口。

根视图控制器头

#import <UIKit/UIKit.h>
#import "PopViewController1.h"
#import "PopViewController2.h"

@interface RootViewController : UIViewController <PopViewControllerDelegate,UIPopoverControllerDelegate>

// Properties for accessing the popover and its viewcontroller (1)
@property (strong, nonatomic) IBOutlet UIButton *btnOpenPopover1;
@property (strong, nonatomic) UIStoryboardPopoverSegue *pvcSegue1;
@property (strong, nonatomic) PopViewController1 *pvc1;

// Properties for accessing the popover and its viewcontroller (2)
@property (strong, nonatomic) IBOutlet UIButton *btnOpenPopover2;
@property (strong, nonatomic) UIStoryboardPopoverSegue *pvcSegue2;
@property (strong, nonatomic) PopViewController2 *pvc2;

@end

根视图控制器方法

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
    }
    return self;
}

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

- (void)viewDidUnload
{
    [self setBtnOpenPopover1:nil];
    [super viewDidUnload];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([[segue identifier] isEqualToString:@"segPop1"]) {
        _pvcSegue1 = (UIStoryboardPopoverSegue *)segue;
        _pvc1 = [segue destinationViewController];
        [_pvc1 setDelegate:self];

    } else ([[segue identifier] isEqualToString:@"segPop2"]); {
        _pvcSegue2 = (UIStoryboardPopoverSegue *)segue;
        _pvc2 = [segue destinationViewController];
        //[_pvc2 setDelegate:self];
        }
    }

// PopViewControllerDelegate callback function
- (void)dismissPop:(NSString *)value {



    [_btnOpenPopover1 setTitle:value forState:UIControlStateNormal];
    [[_pvcSegue1 popoverController] dismissPopoverAnimated: YES]; // dismiss the popover
}

@end

PopViewController1.h

#import <UIKit/UIKit.h>

@protocol PopViewControllerDelegate;

@interface PopViewController1 : UITableViewController

@property (weak) id <PopViewControllerDelegate> delegate;
@property (strong, nonatomic) NSString *strPassedValue;
@property (nonatomic, strong) NSMutableArray *importantChoices;

@end

@protocol PopViewControllerDelegate <NSObject>
@required
- (void)dismissPop:(NSString *)value;
@end

PopViewController1方法

#import "PopViewController1.h"

@interface PopViewController1 ()

@end

@implementation PopViewController1


- (id)initWithCoder:(NSCoder *)aDecoder
{
    //Popover Choices
    _importantChoices = [NSMutableArray array];
    [_importantChoices addObject:@"Extremely Important"];
    [_importantChoices addObject:@"Very Important"];
    [_importantChoices addObject:@"Somewhat Important"];
    [_importantChoices addObject:@"Not Very Important"];
    [_importantChoices addObject:@"Not At All Important"];

    self.clearsSelectionOnViewWillAppear = NO;

    NSInteger rowsCount = [_importantChoices count];
    NSInteger singleRowHeight = [self.tableView.delegate tableView:self.tableView
                                           heightForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
    NSInteger totalRowsHeight = rowsCount * singleRowHeight;

    //Calculate how wide the view should be by finding how
    //wide each string is expected to be
    CGFloat largestLabelWidth = 0;
    for (NSString *colorName in _importantChoices) {
        //Checks size of text using the default font for UITableViewCell's textLabel.
        CGSize labelSize = [colorName sizeWithFont:[UIFont boldSystemFontOfSize:20.0f]];
        if (labelSize.width > largestLabelWidth) {
            largestLabelWidth = labelSize.width;
        }
    }

    //Add a little padding to the width
    CGFloat popoverWidth = largestLabelWidth + 100;

    //Set the property to tell the popover container how big this view will be.
    self.contentSizeForViewInPopover = CGSizeMake(popoverWidth, totalRowsHeight);

    return self;
}



- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Uncomment the following line to preserve selection between presentations.
        //self.clearsSelectionOnViewWillAppear = NO;

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem;
    }
    return self;
}

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

- (void)viewDidUnload
{
    [super viewDidUnload];
}


- (void)viewWillAppear: (BOOL)animated
{

}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [_importantChoices count];}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    cell.textLabel.text = [_importantChoices objectAtIndex:indexPath.row];

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    _strPassedValue = [_importantChoices objectAtIndex:indexPath.row]; 
    [_delegate dismissPop:_strPassedValue];
}

@end

PopViewController2标头

#import <UIKit/UIKit.h>

@protocol PopViewControllerDelegate;

@interface PopViewController2 : UITableViewController

@property (weak) id <PopViewControllerDelegate> delegate;
@property (strong, nonatomic) NSString *strPassedValue2;
@property (nonatomic, strong) NSMutableArray *importantChoices2;

@end

@protocol PopViewControllerDelegate <NSObject>
@required
- (void)dismissPop2:(NSString *)value;
@end

PopViewController2方法

导入“ PopViewController2.h”

@interface PopViewController2（）

@结束

@实现PopViewController2

- (id)initWithCoder:(NSCoder *)aDecoder
{
    //Popover Choices
    _importantChoices = [NSMutableArray array];
    [_importantChoices addObject:@"Extremely Important"];
    [_importantChoices addObject:@"Very Important"];
    [_importantChoices addObject:@"Somewhat Important"];
    [_importantChoices addObject:@"Not Very Important"];
    [_importantChoices addObject:@"Not At All Important"];

    self.clearsSelectionOnViewWillAppear = NO;

    NSInteger rowsCount = [_importantChoices count];
    NSInteger singleRowHeight = [self.tableView.delegate tableView:self.tableView
                                           heightForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
    NSInteger totalRowsHeight = rowsCount * singleRowHeight;

    //Calculate how wide the view should be by finding how
    //wide each string is expected to be
    CGFloat largestLabelWidth = 0;
    for (NSString *colorName in _importantChoices) {
        //Checks size of text using the default font for UITableViewCell's textLabel.
        CGSize labelSize = [colorName sizeWithFont:[UIFont boldSystemFontOfSize:20.0f]];
        if (labelSize.width > largestLabelWidth) {
            largestLabelWidth = labelSize.width;
        }
    }

    //Add a little padding to the width
    CGFloat popoverWidth = largestLabelWidth + 100;

    //Set the property to tell the popover container how big this view will be.
    self.contentSizeForViewInPopover = CGSizeMake(popoverWidth, totalRowsHeight);

    return self;
}



- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Uncomment the following line to preserve selection between presentations.
        //self.clearsSelectionOnViewWillAppear = NO;

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem;
    }
    return self;
}

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

- (void)viewDidUnload
{
    [super viewDidUnload];
}


- (void)viewWillAppear: (BOOL)animated
{

}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [_importantChoices count];}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    cell.textLabel.text = [_importantChoices objectAtIndex:indexPath.row];

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    _strPassedValue = [_importantChoices objectAtIndex:indexPath.row]; 
    [_delegate dismissPop:_strPassedValue];
}

@end

任何帮助或建议，将不胜感激！

布赖恩

Answer 1

对于可重用的代码，您只需要一个版本的PopViewController 。 您的两个版本看起来完全相同，因此请删除其中一个。 在InterfaceBuilder中，将按钮全部设置为单个PopViewController。 根视图控制器如下所示：

@property (strong, nonatomic) IBOutlet UIButton *btnOpenPopover1;
@property (strong, nonatomic) IBOutlet UIButton *btnOpenPopover2;

在prepareForSegue: ，而不是选择一个或另一个PopViewController版本，仅选择一个版本。 向Root View Controller添加一个属性，以对其进行跟踪（这将替换pvc1和pvc2）：

@property (strong, nonatomic) PopViewController* currentPopoverController;

您还需要跟踪正在编辑哪个按钮，因此为此在Root View Controller中添加一个属性（请注意弱引用）：

@property (weak, nonatomic) IBOutlet UIButton* currentButton;

在prepareForSegue:设置这两个prepareForSegue: ，因此如下所示：

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    currentPopoverController = [segue destinationViewController];
    [currentPopoverController setDelegate:self];

    currentButton = (UIButton*) sender;
}

现在，您只需要一个看起来像这样的委托：

- (void)dismissPop:(NSString *)value {

    [currentButton setTitle:value forState:UIControlStateNormal];
    [currentPopoverController dismissPopoverAnimated:YES];
}

Answer 2

我想通了。

我需要将segue放入h文件中，将其设置为segue标题，然后将segue属性添加到prepareForSegue方法中：

_segPopViewController = (UIStoryboardPopoverSegue *)segue;

最后，在代表中，我可以输入以下内容：

[[_segPopViewController popoverController] dismissPopoverAnimated: YES];

和成功！

赞扬原始海报-您帮助了我很多！ 我希望我能投票给你一个以上！！！

布赖恩