导入“PopViewController2.h”

Question

我正在编写一个iPad应用程序，它将有几个按钮，当点击时打开一个弹出框到桌面视图。用户将选择一个值，弹出窗口将被解除，按钮标题将更改。

我使用了一个Popover，然后又想添加另一个。我想写一些好的，干净的可重用代码。

我与代表们的关系很大。应该有多少？每个弹出窗口都应该有它自己的。

Root View Controller Header

#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标题

#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（）

@end

@implementation 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

非常感谢任何帮助或建议!!!

布赖恩

Answer 1

对于可重复使用的代码，您只需要一个PopViewController版本。你的两个版本看起来完全相同，所以摆脱一个版本。在InterfaceBuilder中，将按钮设置为所有segue到单个PopViewController。然后，Root View Controller看起来像这样：

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

在prepareForSegue:中，而不是转到PopViewController的一个版本或另一个版本，只需转到您的单个版本即可。向Root View Controller添加一个属性，以跟踪它（这取代了pvc1和pvc2）：

@property (strong, nonatomic) PopViewController* currentPopoverController;

您还需要跟踪正在编辑的按钮，因此为Root View Controller添加一个属性（请注意弱引用）：

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

在prepareForSegue:中设置这两个，所以它看起来像这样：

-(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

我想出来了。

我需要在h文件中输入我的segue，将其设置为segue标题，然后我将segue属性添加到prepareForSegue方法：

_segPopViewController = (UIStoryboardPopoverSegue *)segue;

最后在代表中我能够放入这一行：

[[_segPopViewController popoverController] dismissPopoverAnimated: YES];

成功！

对原始海报的称赞 - 你帮助了我一吨！我希望我能不止一次投票给你!!!

布赖恩

Storyboard中多个Popovers的最佳模式

导入“PopViewController2.h”

2 个答案: