UINavigationBar的自定义图片

最新推荐文章于 2017-09-14 10:06:32 发布

原创最新推荐文章于 2017-09-14 10:06:32 发布 · 370 阅读

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本文介绍如何通过Objective-C自定义UINavigationBar的背景图片，并确保其能够适配不同的屏幕尺寸，同时保持良好的视觉效果。此外，还提供了一个插入视图的方法以确保背景图始终处于最底层。

。h

#import <UIKit/UIKit.h>

@interface UINavigationBar (UINavigationBarCategory)

UIImageView *backgroundView;

- (void)setBackgroundImage:(UIImage*)image;
- (void)insertSubview:(UIView *)viewatIndex:(NSInteger)index;

@end

。m
#import "CustomNavigationBar.h"

@implementation UINavigationBar (UINavigationBarCategory)

-(void)setBackgroundImage:(UIImage*)image
{
    if(image ==nil)
   {
      [backgroundView removeFromSuperview];
   }
   else
   {
      backgroundView = [[UIImageView alloc]initWithImage:image];
      backgroundView.frame = CGRectMake(0.f, 0.f,self.frame.size.width, self.frame.size.height);
      backgroundView.autoresizingMask = UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;
      [self addSubview:backgroundView];
      [self sendSubviewToBack:backgroundView];
      [backgroundView release];
   }
}

//for other views
- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index
{
    [superinsertSubview:view atIndex:index];
    [selfsendSubviewToBack:backgroundView];
}

@end