首页 文章

UIBarButtonItem具有自定义图像，没有边框

提问于
浏览 次
88

我想用自定义图像创建一个UIBarButtonItem，但我不想要iPhone添加的边框，因为我的图像有一个特殊的边框 .

它与后退按钮相同，但是前进按钮 .

这个应用程序是针对inHouse项目的，所以我不在乎Apple是拒绝或批准它还是喜欢它:-)

如果我使用UIBarButtonItem的initWithCustomView：v属性，我可以这样做：

UIImage *image = [UIImage imageNamed:@"right.png"];

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setBackgroundImage: [image stretchableImageWithLeftCapWidth:7.0 topCapHeight:0.0] forState:UIControlStateNormal];
[button setBackgroundImage: [[UIImage imageNamed: @"right_clicked.png"] stretchableImageWithLeftCapWidth:7.0 topCapHeight:0.0] forState:UIControlStateHighlighted];

 button.frame= CGRectMake(0.0, 0.0, image.size.width, image.size.height);

[button addTarget:self action:@selector(AcceptData)    forControlEvents:UIControlEventTouchUpInside];

UIView *v=[[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, image.size.width, image.size.height) ];

[v addSubview:button];

UIBarButtonItem *forward = [[UIBarButtonItem alloc] initWithCustomView:v];

self.navigationItem.rightBarButtonItem= forward;

[v release];
[image release];

这有效，但如果我必须在10个视图中重复此过程，这不是DRY .

我想我必须继承，但是什么？

  • NSView？

  • UIBarButtonItem？

谢谢，

问候，

ios iphone uibarbuttonitem

9 回答

  • 50

    您可以向UIBarButtonItem添加方法，而无需使用自定义类别对其进行子类化：

    @interface UIBarButtonItem(MyCategory)

+ (UIBarButtonItem*)barItemWithImage:(UIImage*)image target:(id)target action:(SEL)action;

@end

@implementation UIBarButtonItem(MyCategory)

+ (UIBarButtonItem*)barItemWithImage:(UIImage*)image target:(id)target action:(SEL)action{
 // Move your item creation code here
}
@end

    因此，您可以在代码中的任何位置创建调用此方法的条形项（前提是您在其声明中包含 Headers ） .

    附：您不需要使用'v' UIView，因为您可以直接使用按钮创建 UIBarButtonItem 作为自定义视图 .
    P.P.S.您还需要在代码中使用[正向发布] .

    回复于
  • 4

    另一个简单的解决方案

    • 拖动标准UIButton

    • 将按钮的样式设置为自定义，并为该按钮设置图像

    • 将其拖到UINavigationBar上

    • 设置选择器

    回复于
  • 6

    我觉得这很简单 . 它被消化在上面 . “random.png”必须在项目中 . 只需拖放任何图像即可 .

    UIButton *a1 = [UIButton buttonWithType:UIButtonTypeCustom];
        [a1 setFrame:CGRectMake(0.0f, 0.0f, 25.0f, 25.0f)];
        [a1 addTarget:self action:@selector(randomMsg) forControlEvents:UIControlEventTouchUpInside];
        [a1 setImage:[UIImage imageNamed:@"config.png"] forState:UIControlStateNormal];
        UIBarButtonItem *random = [[UIBarButtonItem alloc] initWithCustomView:a1];

 //? line incomplete ?//   imageNamed:@"random.png"] style:UIBarButtonItemStylePlain target:self action:@selector(randomMsg)];

    self.navigationItem.rightBarButtonItem = random;
    回复于
  • 44

    另一种方法是子类UIBarButtonItem . 为什么？这样就可以使用正确的发件人在目标上调用该操作 . 在上面的代码中，操作消息中的sender参数是UIButton实例，而不是UIBarButtonItem实例 . 这很重要，例如，如果您希望从条形按钮项呈现UIPopoverController . 通过继承UIBarButtonItem，您可以添加一个保留原始目标的ivar，允许我们的子类实例使用正确的发送者拦截，修改和转发操作消息 .

    那么，CCFBarButtonItem.h：

    #import <uIKit/UIBarButtonItem.h>

@interface CCFBarButtonItem : UIBarButtonItem
{
@protected
    id _originalTarget;
}
- (id)initWithImage:(UIImage *)image target:(id)target action:(SEL)action;
@end

    和CCFBarButtonItem.m

    #import "CCFBarButtonItem.h"
#import <UIKit/UIButton.h>
#import <UIKit/UIView.h>
#import <UIKit/UIImage.h>

@implementation CCFBarButtonItem

#pragma mark - Object life cycle

- (id)initWithImage:(UIImage *)image target:(id)target action:(SEL)action;
{
    _ASSIGN( _originalTarget, target );

    UIButton *imgButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [imgButton setImage:image forState:UIControlStateNormal];
    imgButton.frame = CGRectMake(0.0, 0.0, image.size.width, image.size.height);
    [imgButton addTarget:self action:action forControlEvents:UIControlEventTouchUpInside];

    self = [super initWithCustomView:imgButton];

    return self;
}

- (void)dealloc;
{
    MCRelease(_originalTarget);
    [super dealloc];
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector;
{
    if( [_originalTarget respondsToSelector:aSelector] )
    {
        return [_originalTarget methodSignatureForSelector:aSelector];
    }
    else
    {
        return [super methodSignatureForSelector:aSelector];
    }
}

- (void)forwardInvocation:(NSInvocation *)anInvocation;
{
    SEL aSelector = [anInvocation selector];
    if( [_originalTarget respondsToSelector:aSelector] )
    {
        //  modify the 'sender' argument so that it points to self
        [anInvocation setArgument:&self atIndex:2];
        [anInvocation invokeWithTarget:_originalTarget];
    }
    else
    {
        [self doesNotRecognizeSelector:aSelector];
    }
}
@end
    回复于
  • 1
    UIBarButtonItem *menuItem = [[UIBarButtonItem alloc] initWithImage: [UIImage imageNamed:@"icon-menu.png"]
                                                                    style:UIBarButtonItemStylePlain
                                                                   target:self
                                                                   action:@selector(showMenu)];
    回复于
  • 3

    这也可以通过编程方式完成（当然）：

    首先，创建一个自定义视图 . 此自定义视图可以包含图像，按钮或您想要的任何其他内容 . 自定义视图可以通过编程方式或在IB中进行：

    UIImage *customImage = [UIImage imageNamed:@"imageName"];
UIView *customView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, customImage.size.width, customImage.size.height)];
customView.backgroundColor = [UIColor colorWithPatternImage:customImage];

    接下来，创建一个UIBarButtonItem并使用自定义视图对其进行初始化 .

    UIBarButtonItem *customBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:customView];

    现在，只需将自定义UIBarButton添加到leftBarButtonItem：

    self.navigationItem.leftBarButtonItem = customBarButtonItem;
    回复于
  • 0

    好吧，这个类别非常好，因为Popovercontroller没有问题:-)

    #import <UIKit/UIKit.h>

@interface UIBarButtonItem (BarButtonItemExtended)
+ (UIBarButtonItem*)barItemWithImage:(UIImage*)image target:(id)target action:(SEL)action;
-(void)performBarButtonAction:(id)sender;
@end



#import "UIBarButtonItem+BarButtonItemExtended.h"

@implementation UIBarButtonItem (BarButtonItemExtended)

+ (UIBarButtonItem*)barItemWithImage:(UIImage*)image target:(id)target action:(SEL)action
{    
    UIButton *imgButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [imgButton setImage:image forState:UIControlStateNormal];
    imgButton.frame = CGRectMake(0.0, 0.0, image.size.width, image.size.height);

    UIBarButtonItem *b = [[UIBarButtonItem alloc]initWithCustomView:imgButton];

    [imgButton addTarget:b action:@selector(performBarButtonAction:) forControlEvents:UIControlEventTouchUpInside];

    [b setAction:action];
    [b setTarget:target];

    return b;
}

-(void)performBarButtonAction:(UIButton*)sender
{
    [[self target] performSelector:self.action withObject:self];
}
@end
    回复于
  • 1

    检查这个简单的解决方案 .

    - (void)splitViewController:(UISplitViewController *)splitController willHideViewController:(UIViewController *)viewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)popoverController
{
barButtonItem.image = [UIImage imageNamed:@"navButton.png"];
barButtonItem.style = UIBarButtonItemStylePlain;

[barButtonItem setBackgroundImage:[UIImage imageNamed:@"1x1.png"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[self.navigationItem setLeftBarButtonItem:barButtonItem animated:YES];
self.masterPopoverController = popoverController;
}

    这里1x1.png是1像素透明png图像，您可以从下面的链接下载

    http://commons.wikimedia.org/wiki/File:1x1.png

    回复于
  • 37

    另一个解决方案，认为以编程方式创建按钮时更简单：

    UIBarButtonItem *button = [[UIBarButtonItem alloc] initWithImage:defaultImage
                                             landscapeImagePhone:landscapeImage
                                                           style:UIBarButtonItemStylePlain
                                                          target:self
                                                          action:@selector(someSelector)];
[button setBackgroundImage:[UIImage new] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[button setBackgroundImage:[UIImage new] forState:UIControlStateNormal barMetrics:UIBarMetricsLandscapePhone];
    回复于

相关问题