iphone - 如何为 UIBarButtonItem 灵活空间设置图像 - IOS

Question

看看这张图片...

我想设计这样的工具栏，每个 UIBarButtonItem 应该用细线分隔。所以我在每个 UIBarButtonItem 之间插入了灵活的空间按钮（这有助于我在方向改变时对齐 UIBarButtonItem），但是如果我为此设置一个图像，它不再充当灵活按钮，而是变为普通的 UIBarbutton。

所以我需要一个带有图像的灵活空间按钮。知道怎么做。（或）如何设计像上面这样的 UIToolbar ......任何帮助都非常感谢。谢谢

Answer 1

我想这会对你有所帮助..

UIImage* topImage = [UIImage imageNamed:@"TabBarGradient.png"];

// Create a new image context
UIGraphicsBeginImageContextWithOptions(CGSizeMake(width, topImage.size.height*2), NO, 0.0);

// Create a stretchable image for the top of the background and draw it
UIImage* stretchedTopImage = [topImage stretchableImageWithLeftCapWidth:0 topCapHeight:0];
[stretchedTopImage drawInRect:CGRectMake(0, 0, width, topImage.size.height)];

// Draw a solid black color for the bottom of the background
[[UIColor blackColor] set];
CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(0, topImage.size.height, width, topImage.size.height));

// Generate a new image
UIImage* resultImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return resultImage;

有关更多详细信息，您可以检查...

http://idevrecipes.com/2011/01/04/how-does-the-twitter-iphone-app-implement-a-custom-tab-bar/

如果没有解决您的问题..让我知道..

Answer 2

为 UIBarbuttonItem 设置背景图片

UIImage *faceImage = [UIImage imageNamed:@"facebook.png"];
UIButton *face = [UIButton buttonWithType:UIButtonTypeCustom];
face.bounds = CGRectMake( 0, 0, faceImage.size.width, faceImage.size.height );
[face setImage:faceImage forState:UIControlStateNormal];
UIBarButtonItem *faceBtn = [[UIBarButtonItem alloc] initWithCustomView:face];