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iOS8 自定义navigationbar 以及 UIBarButtonItem 边距问题

时间:2015-06-10 08:58:53      阅读:229      评论:0      收藏:0      [点我收藏+]

标签:ios   uinavigationcontroll   uibutton   uiimage   objective-c   

一。自定义navigationbar

 

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- (void)initNavigationBar{

    [self.navigationController setNavigationBarHidden:YES];

    UINavigationBar *bar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 32)];

    [bar setBackgroundImage:[UIImage imageNamed:@"zhuche_bar2.png"] forBarMetrics:UIBarMetricsDefault]; 

    UINavigationItem *item = [[UINavigationItem alloc] initWithTitle:nil];

    UIButton *left = [UIButton buttonWithType:UIButtonTypeCustom];

    [left setFrame:CGRectMake(0, 2, 28, 28)];

    [left setImage:[UIImage imageNamed:@"zhuche_back.png"] forState:UIControlStateNormal];

    [left addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithCustomView:left];

    [item setLeftBarButtonItem:leftButton];

    [bar pushNavigationItem:item animated:NO];

    [self.view addSubview:bar];

}


- (void)back{

    [self.navigationController popViewControllerAnimated:YES];

}
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虽然可以解决自定义navigationbar的问题,左右按钮都可以替换,但是如果放在UITableViewController中,自定义的navigationbar会随着scrollview的滑动而滑动,不会像系统自带的navigationbar一样始终保持在屏幕最上方。那么我们可以有第二种解决方式,修改原来的navigationbar,其实就是改一下leftBarButtonItem或者rightBarButtonItem在navigationbar上面的位置:修改UIBarButtonItem 的边距

二。修改UIBarButtonItem 的边距

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@interface UINavigationItem (margin)

@end

@implementation UINavigationItem (margin)

#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1
- (void)setLeftBarButtonItem:(UIBarButtonItem *)_leftBarButtonItem
{
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
    {
        UIBarButtonItem *negativeSeperator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
        negativeSeperator.width = -16;//此处修改到边界的距离,请自行测试
        
        if (_leftBarButtonItem)
        {
            [self setLeftBarButtonItems:@[negativeSeperator, _leftBarButtonItem]];
        }
        else
        {
            [self setLeftBarButtonItems:@[negativeSeperator]];
        }
       
        
    }
    else
    {
        [self setLeftBarButtonItem:_leftBarButtonItem animated:NO];
    }
}

- (void)setRightBarButtonItem:(UIBarButtonItem *)_rightBarButtonItem
{
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
    {
        UIBarButtonItem *negativeSeperator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
        negativeSeperator.width = -12;//此处修改到边界的距离,请自行测试
        
        if (_rightBarButtonItem)
        {
            [self setRightBarButtonItems:@[negativeSeperator, _rightBarButtonItem]];
        }
        else
        {
            [self setRightBarButtonItems:@[negativeSeperator]];
        }
        
    }
    else
    {
        [self setRightBarButtonItem:_rightBarButtonItem animated:NO];
    }
}

#endif
@end
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以上代码可以放置在主视图控制器的.m文件里面,@implementation ViewController的上面

参考资料:http://blog.csdn.net/reylen/article/details/16338781;

http://blog.163.com/lhl_soft/blog/static/201750004201292043750125/;


iOS8 自定义navigationbar 以及 UIBarButtonItem 边距问题

标签:ios   uinavigationcontroll   uibutton   uiimage   objective-c   

原文地址:http://blog.csdn.net/shockyu/article/details/46432795

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