UIBarButtonItem具有自定义图像，没有边框 [英] UIBarButtonItem with custom image and no border

问题描述

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，因为我的图像有一个特殊的边框。

I want to create a UIBarButtonItem with a custom image, but I don't want the border that iPhone adds, as my Image has a special border.

它是与后退按钮相同但是前进按钮。

It's the same as the back button but a forward button.

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： - ）

This App is for an inHouse project, so I don't care if Apple reject or approves it or likes it :-)

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

If I use the initWithCustomView:v property of the UIBarButtonItem, I can do it:

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，这不是DRY。

This works, but if I have to repeat this process in 10 views, this is not DRY.

我想我必须继承，但是什么？

I suppose I have to subclass, but what ?

• NSView？


• UIBarButtonItem？

谢谢，

问候，

推荐答案

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：

You can add a method to UIBarButtonItem without subclassing it using custom category:

@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（前提是您包含带声明的标题）。

So anywhere in your code you can create bar item calling this method (provided that you include a header with its declaration).

PS您不需要使用'v'UIView，因为您可以直接使用按钮创建 UIBarButtonItem 。

P.P.S.您还需要在代码中使用[正向发布]。

P.S. You do not need to use 'v' UIView as you can create UIBarButtonItem with a button as custom view directly.
P.P.S. You also need [forward release] in your code.

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