iOS：在自定义导航栏中定位导航栏按钮 [英] iOS: Positioning navigation bar buttons within custom navigation bar

问题描述

我正在使用自定义导航栏构建应用。经过一些研究后，我决定使用UINavigationBar上的类别来做这件事。导航栏需要比平时稍大一点才能容纳投影。以下是代码：

I'm building an app with a custom navigation bar. After some research I decided to do this using a category on UINavigationBar. The navigation bar needs to be a bit larger than usual to accomodate a drop shadow. Here is the code:

#import "UINavigationBar+CustomWithShadow.h"

@implementation UINavigationBar (CustomWithShadow)

- (void)drawRect:(CGRect)rect {

    // Change the tint color in order to change color of buttons
    UIColor *color = [UIColor colorWithHue:0.0 saturation:0.0 brightness:0.0 alpha:0.0];
    self.tintColor = color;

    // Add a custom background image to the navigation bar 
    UIImage *image = [UIImage imageNamed:@"NavBar.png"];
    [image drawInRect:CGRectMake(0, 0, self.frame.size.width, 60)];
}

- (void)layoutSubviews {

    self.frame = CGRectMake(0, 20, self.frame.size.width, 60);
}
@end

现在唯一的问题是更大的导航栏意味着导航栏按钮结束得太远，如下所示：

The only problem now is that the larger navigation bar means that the navigation bar buttons end up too far down, like so:

有谁知道如何纠正按钮的位置？

Does anyone know how I can correct the position of the buttons?

感谢您的帮助！

更新：

我在视图控制器的init方法中将按钮添加到导航栏，如下所示：

I add the buttons to the nav bar in the init method of the view controller like so:

// Create "Add" button for the nav bar
UIBarButtonItem *addButton = [[UIBarButtonItem alloc] 
    initWithBarButtonSystemItem:UIBarButtonSystemItemAdd 
    target:self 
    action:@selector(createNewEntry:)];
[[self navigationItem] setRightBarButtonItem:addButton];
[addButton release];

推荐答案

您需要将leftBarButtonItem和rightBarButtonItem添加为自定义项目和框架混乱....例如：

You'll need to add the leftBarButtonItem and rightBarButtonItem as custom items and mess with the frames.... for example:

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0,5,buttonImage.size.width,buttonImage.size.height)];
[button setBackgroundImage:buttonImage forState:UIControlStateNormal];
[button addTarget:delegate action:@selector(barButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
[button setTitle:titleString forState:UIControlStateNormal];
[button setTitleColor:CUSTOM_BAR_BUTTON_TITLE_COLOR forState:UIControlStateNormal];
[[button titleLabel] setFont:[UIFont boldSystemFontOfSize:14]];
[[button titleLabel] setShadowColor:CUSTOM_BAR_BUTTON_SHADOW_COLOR];
[[button titleLabel] setShadowOffset:CGSizeMake(0,-1)];

UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithCustomView:button];
[button release];

[[self navigationItem] setRightBarButtonItem:barButton];
[barButton release];

这篇关于iOS：在自定义导航栏中定位导航栏按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！