我的 iPhone View 在其工具栏中添加了一些自定义按钮。每个按钮都有图像和文本标题,创建方式如下:
UIBarButtonItem *fooButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"foo.png"] style:UIBarButtonItemStylePlain target:self action:@selector(fooButtonPressed:)];
fooButton.title=@"Foo";
标题文字显示非常暗淡;看起来它的 alpha 约为 0.5。如果我使用默认的 UIToolBar barStyle,我根本无法读取文本。使用 UIBarStyleBlack 时,我可以阅读文本,但它看起来仍然很暗淡。
我也尝试过initWithTitle,然后设置image属性;结果是相同的。
有没有办法让文字变亮?我希望外观类似于 UITabBar,其项目既有图像又有标题。
感谢您的帮助!
最佳答案
我试图使用 UIBarButtonItem 来显示图像和按钮,但我很确定它已锁定以显示其中一个或另一个。使用this thread中的基本思想我想出了一个使用 UIButton 和背景图像的解决方案。我所做的最大缺陷是,当标题文本大小变化很大时,背景图像会拉伸(stretch),导致圆角看起来有点偏离。
CustomBarButtonItem.h
#import <UIKit/UIKit.h>
@interface CustomBarButtonItem : UIBarButtonItem {}
- (id) initWithImage:(UIImage *)image title:(NSString *)title target:(id)target action:(SEL)action;
@end
@interface UIBarButtonItem (CustomBarButtonItem)
+ (UIBarButtonItem *) barButtonItemWithImage:(UIImage *)image title:(NSString *)title target:(id)target action:(SEL)action;
@end
CustomBarButtonItem.m
#import "CustomBarButtonItem.h"
@implementation CustomBarButtonItem
- (id) initWithImage:(UIImage *)image title:(NSString *)title target:(id)target action:(SEL)action {
UIButton *barButton = [UIButton buttonWithType:UIButtonTypeCustom];
UIFont *font = [UIFont boldSystemFontOfSize:13];
barButton.titleLabel.font = font;
barButton.titleLabel.shadowOffset = CGSizeMake(0, -1);
barButton.titleEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 5);
[barButton setImage:image forState:UIControlStateNormal];
[barButton setTitle:title forState:UIControlStateNormal];
[barButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[barButton setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];
[barButton setTitleShadowColor:[[UIColor blackColor] colorWithAlphaComponent:0.5] forState:UIControlStateNormal];
[barButton setBackgroundImage:[UIImage imageNamed:@"bar-button-item-background.png"] forState:UIControlStateNormal];
barButton.frame = CGRectMake(0, 0, image.size.width + 15 + [title sizeWithFont:font].width, 30);
if (self = [super initWithCustomView:barButton]) {
self.target = target;
self.action = action;
}
return self;
}
@end
@implementation UIBarButtonItem (CustomBarButtonItem)
+ (UIBarButtonItem *) barButtonItemWithImage:(UIImage *)image title:(NSString *)title target:(id)target action:(SEL)action {
return [[[CustomBarButtonItem alloc] initWithImage:image title:title target:target action:action] autorelease];
}
@end
使用示例:
UIBarButtonItem *customButtonItem = [UIBarButtonItem barButtonItemWithImage:[UIImage imageNamed:@"calendar.png"] title:@"Add to calendar" target:self action:@selector(addToCalendar)];
我的按钮背景图片是:
关于iphone - 具有图像和标题的 UIToolbar UIBarButtonItem 的文本非常暗淡,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1533238/