我在NavBar中有一个自定义rightBarButtomItem的奇怪错误。我有一个TabBar应用程序。如果加载了应用程序，则按钮显示正确。如果我点击标签，按钮会一直显示。如果我回到已经显示的其中一个标签，按钮就会消失。最后，该按钮仅在其中一个选项卡中随机显示。
如果我以编程方式设置标准的rightBarButtomItem，我的代码将完美运行。但不是自定义图形。如果按下并弹出ChildViewController，则会再次出现该按钮。它似乎仍在那里，但不可见！
我认为我在CustomTabBarViewController中引用sharedRightButton是错误的！
有人可以帮忙吗？
CustomTabBarController.h
#import <UIKit/UIKit.h>
#import "EZBadgeView.h"
@interface CustomTabBarController : UITabBarController
{
EZBadgeView *badgeView;
UIButton *btn;
UIImage *rightBarButtonItemImage;
UIImage *rightBarButtonItemImageTapped;
UIImage *rightBarButtonItemImageSelected;
}
@property (nonatomic, strong) UIBarButtonItem *sharedRightButton;
@property (nonatomic, strong) EZBadgeView *badgeView;
@property(nonatomic, strong) UIButton *btn;
@property(nonatomic, strong) UIImage *rightBarButtonItemImage;
@property(nonatomic, strong) UIImage *rightBarButtonItemImageTapped;
@property(nonatomic, strong) UIImage *rightBarButtonItemImageSelected;
@end
CustomTabBarController.m
#import "CustomTabBarController.h"
@interface CustomTabBarController ()
@end
@implementation CustomTabBarController
@synthesize sharedRightButton, badgeView, btn, rightBarButtonItemImage, rightBarButtonItemImageSelected, rightBarButtonItemImageTapped;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateBadgeNumber:) name:@"updateBadgeNumber" object:nil];
if (self.badgeView && self.badgeView.superview)
{
[self.badgeView removeFromSuperview];
}
self.badgeView = [[EZBadgeView alloc] init];
CGRect badgeFrame = self.badgeView.frame;
badgeFrame.origin.x = 31.0f;
badgeFrame.origin.y = -6.0f;
badgeFrame = CGRectIntegral(badgeFrame);
self.badgeView.frame = badgeFrame;
self.badgeView.badgeBackgroundColor = [self colorWithRGBHex:kRed withAlpha:1.0f];
self.badgeView.userInteractionEnabled = NO;
self.badgeView.badgeTextFont = [UIFont fontWithName:@"BrownStd-Bold" size:12];
self.badgeView.shouldShowGradient = NO;
self.badgeView.shouldShowShine = NO;
// Allocate UIButton
self.btn = [UIButton buttonWithType:UIButtonTypeCustom];
self.btn.frame = CGRectMake(0, 0, 46, 30);
self.rightBarButtonItemImage = [UIImage imageNamed:@"button_mixer.png"];
[self.btn setBackgroundImage:rightBarButtonItemImage forState:UIControlStateNormal];
self.rightBarButtonItemImageTapped = [UIImage imageNamed:@"button_mixer_pressed.png"];
[self.btn setBackgroundImage:rightBarButtonItemImageTapped forState:UIControlStateHighlighted];
self.rightBarButtonItemImageSelected = [UIImage imageNamed:@"button_mixer_active.png"];
[self.btn setBackgroundImage:rightBarButtonItemImageSelected forState:UIControlStateSelected];
[self.btn addTarget:self action:@selector(clickedTest:) forControlEvents:UIControlEventTouchUpInside];
[self.btn setBackgroundColor:[UIColor clearColor]];
[self.btn addSubview:self.badgeView]; //Add NKNumberBadgeView as a subview on UIButton
// Initialize UIBarbuttonitem...
self.sharedRightButton = [[UIBarButtonItem alloc] initWithCustomView:btn];
self.badgeView.badgeValue = @"0";
self.badgeView.hidden = YES;
}
- (void)updateBadgeNumber:(NSMutableArray *)soundArray
{
self.badgeView.badgeValue = [NSString stringWithFormat:@"%i",[soundArray count]];
self.badgeView.hidden = ([soundArray count] == 0);
}
- (void)clickedTest:(id)sender
{
NSLog(@"%s", __FUNCTION__);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (UIColor *)colorWithRGBHex:(UInt32)hex withAlpha:(float)alpha
{
int r = (hex >> 16) & 0xFF;
int g = (hex >> 8) & 0xFF;
int b = (hex) & 0xFF;
return [UIColor colorWithRed:r / 255.0f
green:g / 255.0f
blue:b / 255.0f
alpha:alpha];
}
@end
我在每个视图中都设置了这样的按钮：
@implementation MyVC
@synthesize tabBarController;
- (void)viewDidLoad
{
//NSLog(@"begin: %s", __FUNCTION__);
[super viewDidLoad];
// right bar button from custom tabbarcontroller
self.tabBarController = [[CustomTabBarController alloc] init];
self.navigationItem.rightBarButtonItem = self.tabBarController.sharedRightButton;
}
答案 0 :(得分：1)
让我感到震惊的是，为每个视图控制器创建一个新的CustomTabBarController从根本上是错误的，特别是如果要解决你的右键没有出现的问题。问题在于您正在创建新的幻像标签栏控制器，更糟糕的是，丢失了对视图控制器真实标签栏控制器的引用。
您的解决方案会解决问题的核心问题，因为您要为按钮添加子视图，即创建UIBarButtonItem initWithCustomView等等，您无法共享带有多个导航控制器的按钮如果您使用UIBarButtonItem（或其他类似的简单变体）创建简单的initWithTitle，则共享的常用右侧栏按钮会起作用，但如果您使用按钮的自定义视图执行此操作则不起作用。
正确的解决方案是创建一个具有所需行为和外观的新UIBarButtonItem实例。然后，任何需要该按钮项的视图控制器都可以创建该按钮的实例。因此，新的自定义RightBarButtonItem可能如下所示：
RightBarButtonItem.h：
@interface RightBarButtonItem : UIBarButtonItem
- (id)initWithTarget:(id)target action:(SEL)action;
@end
RightBarButtonItem.m：
@interface RightBarButtonItem ()
@property (nonatomic, strong) EZBadgeView *badgeView;
@end
@implementation RightBarButtonItem
- (id)initWithTarget:(id)target action:(SEL)action
{
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(0, 0, 46, 30);
self = [super initWithCustomView:button];
if (self)
{
_badgeView = [[EZBadgeView alloc] init];
CGRect badgeFrame = self.badgeView.frame;
badgeFrame.origin.x = 31.0f;
badgeFrame.origin.y = -6.0f;
badgeFrame = CGRectIntegral(badgeFrame);
_badgeView.frame = badgeFrame;
_badgeView.badgeBackgroundColor = [self colorWithRGBHex:kRed withAlpha:1.0f];
_badgeView.userInteractionEnabled = NO;
_badgeView.badgeTextFont = [UIFont fontWithName:@"BrownStd-Bold" size:12];
_badgeView.shouldShowGradient = NO;
_badgeView.shouldShowShine = NO;
[button setBackgroundImage:[UIImage imageNamed:@"button_mixer.png"] forState:UIControlStateNormal];
[button setBackgroundImage:[UIImage imageNamed:@"button_mixer_pressed.png"] forState:UIControlStateHighlighted];
[button setBackgroundImage:[UIImage imageNamed:@"button_mixer_active.png"] forState:UIControlStateSelected];
[button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
[button setBackgroundColor:[UIColor clearColor]];
[button addSubview:_badgeView]; //Add NKNumberBadgeView as a subview on UIButton
_badgeView.badgeValue = @"0";
_badgeView.hidden = YES;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(updateBadgeNumber:)
name:@"updateBadgeNumber"
object:nil];
}
return self;
}
- (void)dealloc
{
// don't forget to have mechanism to remove the observer when this button is deallocated
[[NSNotificationCenter defaultCenter] removeObserver:self
name:@"updateBadgeNumber"
object:nil];
}
- (void)updateBadgeNumber:(NSMutableArray *)soundArray
{
self.badgeView.badgeValue = [NSString stringWithFormat:@"%i",[soundArray count]];
self.badgeView.hidden = ([soundArray count] == 0);
}
- (UIColor *)colorWithRGBHex:(UInt32)hex withAlpha:(float)alpha
{
int r = (hex >> 16) & 0xFF;
int g = (hex >> 8) & 0xFF;
int b = (hex) & 0xFF;
return [UIColor colorWithRed:r / 255.0f
green:g / 255.0f
blue:b / 255.0f
alpha:alpha];
}
@end
然后，CustomTabBarController大大简化了：
CustomTabBarController.h：
@interface CustomTabBarController : UITabBarController
- (UIBarButtonItem *)rightBarButton;
@end
CustomTabBarController.m：
#import "RightBarButtonItem.h"
@implementation CustomTabBarController
- (UIBarButtonItem *)rightBarButton
{
return [[RightBarButtonItem alloc] initWithTarget:self
action:@selector(clickedTest:)];
}
- (void)clickedTest:(id)sender
{
NSLog(@"%s", __FUNCTION__);
}
@end
最后，添加到标签栏控制器的所有视图控制器都可以执行：
- (void)viewDidLoad
{
[super viewDidLoad];
CustomTabBarController *tabBarController = (id)self.tabBarController;
self.navigationItem.rightBarButtonItem = [tabBarController rightBarButton];
}
所有这些都实现了您提出的解决方案的关键部分，即确保我们拥有正确的条形按钮项的唯一实例，但没有创建冗余标签栏控制器的问题。