在UIToolbar上创建左箭头按钮（如UINavigationBar的“后退”样式）

本文翻译自：Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar

I'd love to create a "back" left-arrow-bezel button in a UIToolbar . 我想在UIToolbar创建一个“后退”左箭头边框按钮。

As far as I can tell, the only way to get one of these is to leave UINavigationController at default settings and it uses one for the left bar item. 据我所知，获得其中一个的唯一方法是将UINavigationController保留为默认设置，并使用一个用于左栏项。 But there's no way I can find to create one as a UIBarButtonItem , so I can't make one in a standard UIToolbar , even though they're very similar to UINavigationBar s. 但是我无法找到创建一个UIBarButtonItem ，所以我不能在标准的UIToolbar创建一个，即使它们与UINavigationBar非常相似。

I could manually create it with button images, but I can't find the source images anywhere. 我可以用按钮图像手动创建它，但我无法在任何地方找到源图像。 They have alpha-channel edges, so screenshotting and cutting won't get very versatile results. 它们具有alpha通道边缘，因此截屏和切割不会得到非常多样化的结果。

Any ideas beyond screenshotting for every size and color scheme I intend to use? 除了我打算使用的每种尺寸和配色方案的截图之外的任何想法？

Update: PLEASE STOP dodging the question and suggesting that I shouldn't be asking this and should be using UINavigationBar . 更新：请停止躲避问题并建议我不应该问这个并且应该使用UINavigationBar 。 My app is Instapaper Pro. 我的应用程序是Instapaper Pro。 It shows only a bottom toolbar (to save space and maximize readable content area), and I wish to put a left-arrow-shaped Back button in the bottom. 它只显示一个底部工具栏（为了节省空间和最大化可读内容区域），我希望在底部放置一个左箭头形状的后退按钮。

Telling me that I shouldn't need to do this is not an answer and certainly doesn't deserve a bounty. 告诉我，我不应该这样做不是一个答案，当然不值得赏心悦目。

#1楼

参考：https://stackoom.com/question/X4y/在UIToolbar上创建左箭头按钮-如UINavigationBar的-后退-样式

#2楼

Here's what I ended up doing after searching through all these solutions and others. 这是我在搜索所有这些解决方案和其他解决方案后最终做的事情。 It uses a stretchable png's extracted from the UIKit stock images. 它使用从UIKit stock图像中提取的可伸缩png。 This way you can set the text to whatever you liek 这样您就可以将文本设置为您所拥有的任何内容

// Generate the background images
UIImage *stretchableBackButton = [[UIImage imageNamed:@"UINavigationBarDefaultBack.png"] stretchableImageWithLeftCapWidth:14 topCapHeight:0];
UIImage *stretchableBackButtonPressed = [[UIImage imageNamed:@"UINavigationBarDefaultBackPressed.png"] stretchableImageWithLeftCapWidth:13 topCapHeight:0];
// Setup the UIButton
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[backButton setBackgroundImage:stretchableBackButton forState:UIControlStateNormal];
[backButton setBackgroundImage:stretchableBackButtonPressed forState:UIControlStateSelected];
NSString *buttonTitle = NSLocalizedString(@"Back", @"Back");
[backButton setTitle:buttonTitle forState:UIControlStateNormal];
[backButton setTitle:buttonTitle forState:UIControlStateSelected];
backButton.titleEdgeInsets = UIEdgeInsetsMake(0, 5, 2, 1); // Tweak the text position
NSInteger width = ([backButton.titleLabel.text sizeWithFont:backButton.titleLabel.font].width + backButton.titleEdgeInsets.right +backButton.titleEdgeInsets.left);
[backButton setFrame:CGRectMake(0, 0, width, 29)];
backButton.titleLabel.font = [UIFont boldSystemFontOfSize:13.0f];
[backButton addTarget:self action:@selector(yourSelector:) forControlEvents:UIControlEventTouchDown];
// Now add the button as a custom UIBarButtonItem
UIBarButtonItem *backButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:backButton] autorelease];
self.navigationItem.leftBarButtonItem = backButtonItem;

#3楼

Try this. 试试这个。 I am sure you do not need a back button image to create one such. 我相信你不需要一个后退按钮图像来创建一个这样的。

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back"style:UIBarButtonItemStyleBorderedtarget:selfaction:@selector(yourSelectorGoesHere:)];
self.navigationItem.backBarButtonItem = backButton;

That's all you have to do :) 这就是你所要做的:)

#4楼

The Three20 library has a way to do this: Three20库有一种方法可以做到这一点：

  UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle: @"Title" style:UIBarButtonItemStylePlain target:self action:@selector(foo)];UIColor* darkBlue = RGBCOLOR(109, 132, 162);TTShapeStyle* style = [TTShapeStyle styleWithShape:[TTRoundedLeftArrowShape shapeWithRadius:4.5] next:[TTShadowStyle styleWithColor:RGBCOLOR(255,255,255) blur:1 offset:CGSizeMake(0, 1) next:[TTReflectiveFillStyle styleWithColor:darkBlue next:[TTBevelBorderStyle styleWithHighlight:[darkBlue shadow]shadow:[darkBlue multiplyHue:1 saturation:0.5 value:0.5]width:1 lightSource:270 next:[TTInsetStyle styleWithInset:UIEdgeInsetsMake(0, -1, 0, -1) next:[TTBevelBorderStyle styleWithHighlight:nil shadow:RGBACOLOR(0,0,0,0.15)width:1 lightSource:270 next:nil]]]]]];TTView* view = [[[TTView alloc] initWithFrame:CGRectMake(0, 0, 80, 35)] autorelease];view.backgroundColor = [UIColor clearColor];view.style = style;backButton.customView = view;self.navigationItem.leftBarButtonItem = backButton;

#5楼

I had a similar problem, and come out one library PButton . 我有一个类似的问题，并出来一个库PButton 。 And the sample is the back navigation button like button, which can be used anywhere just like a customized button. 示例是按钮之类的后退导航按钮，可以像定制按钮一样在任何地方使用。

Something like this: 像这样的东西：

#6楼

First of all you have to find an image of the back button. 首先，你必须找到后退按钮的图像。 I used a nice app called Extractor that extracts all the graphics from iPhone. 我使用了一个名为Extractor的漂亮应用程序，可以从iPhone中提取所有图形。 In iOS7 I managed to retrieve the image called UINavigationBarBackIndicatorDefault and it was in black colour, since I needed a red tint I change the colour to red using Gimp. 在iOS7中，我设法检索名为UINavigationBarBackIndicatorDefault的图像并且它是黑色的，因为我需要一个红色调，我使用Gimp将颜色更改为红色。

EDIT: 编辑：

As was mentioned by btate in his comment, there is no need to change the color with the image editor. 正如btate在评论中提到的那样，没有必要使用图像编辑器来改变颜色。 The following code should do the trick: 以下代码应该可以解决问题：

imageView.tint = [UIColor redColor];
imageView.image = [[UIImage imageNamed:@"UINavigationBarBackIndicatorDefault"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

Then I created a view that contains an imageView with that arrow, a label with the custom text and on top of the view I have a button with an action. 然后我创建了一个视图，其中包含带有该箭头的imageView，带有自定义文本的标签，并且在视图的顶部，我有一个带动作的按钮。 Then I added a simple animation (fading and translation). 然后我添加了一个简单的动画（淡入淡出和翻译）。

The following code simulates the behaviour of the back button including animation. 以下代码模拟后退按钮的行为，包括动画。

-(void)viewWillAppear:(BOOL)animated{UIImageView *imageView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"UINavigationBarBackIndicatorDefault"]];[imageView setTintColor:[UIColor redColor]];UILabel *label=[[UILabel alloc] init];[label setTextColor:[UIColor redColor]];[label setText:@"Blog"];[label sizeToFit];int space=6;label.frame=CGRectMake(imageView.frame.origin.x+imageView.frame.size.width+space, label.frame.origin.y, label.frame.size.width, label.frame.size.height);UIView *view=[[UIView alloc] initWithFrame:CGRectMake(0, 0, label.frame.size.width+imageView.frame.size.width+space, imageView.frame.size.height)];view.bounds=CGRectMake(view.bounds.origin.x+8, view.bounds.origin.y-1, view.bounds.size.width, view.bounds.size.height);[view addSubview:imageView];[view addSubview:label];UIButton *button=[[UIButton alloc] initWithFrame:view.frame];[button addTarget:self action:@selector(handleBack:) forControlEvents:UIControlEventTouchUpInside];[view addSubview:button];[UIView animateWithDuration:0.33 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{label.alpha = 0.0;CGRect orig=label.frame;label.frame=CGRectMake(label.frame.origin.x+25, label.frame.origin.y, label.frame.size.width, label.frame.size.height);label.alpha = 1.0;label.frame=orig;} completion:nil];UIBarButtonItem *backButton =[[UIBarButtonItem alloc] initWithCustomView:view];
}- (void) handleBack:(id)sender{
}

EDIT: 编辑：

Instead of adding the button, in my opinion the better approach is to use a gesture recognizer. 在我看来，更好的方法是使用手势识别器，而不是添加按钮。

UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleBack:)];
[view addGestureRecognizer:tap];
[view setUserInteractionEnabled:YES];

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在UIToolbar上创建左箭头按钮（如UINavigationBar的“后退”样式）

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