我想创建一个带有自定义图像的UIBarButtonItem，但我不想要iPhone添加的边框，因为我的Image有一个特殊的边框。
它与后退按钮相同，但是前进按钮。
此应用程序适用于inHouse项目，因此我不关心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];
这样可行，但如果我必须在10个视图中重复此过程，那么这不是DRY。
我想我必须继承，但是什么？
感谢，
的问候，
答案 0 :(得分：50)
另一个简单的解决方案是
答案 1 :(得分：44)
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（前提是您在其中包含带声明的标题）。
P.S。您不需要使用'v'UIView，因为您可以使用按钮直接创建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]。
答案 2 :(得分：37)
我发现这很简单。建议在顶部。 “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;
答案 3 :(得分：6)
另一种方法是继承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。通过子类化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件人拦截，修改和转发操作消息。
所以，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
答案 4 :(得分：4)
UIBarButtonItem *menuItem = [[UIBarButtonItem alloc] initWithImage: [UIImage imageNamed:@"icon-menu.png"]
style:UIBarButtonItemStylePlain
target:self
action:@selector(showMenu)];
答案 5 :(得分：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;
答案 6 :(得分：1)
好的，这个类别非常好用，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
答案 7 :(得分：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;
}
此处1x1.png是1像素透明png图像，您可以从下面的链接下载
答案 8 :(得分：0)
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];