UISearchBar:清除背景色或设置背景图像[重复]

2020/12/16 20:52 · ios ·  · 0评论

如何设置搜索栏(如便笺应用程序)的背景图像或清除背景?

我只是想出了一个效果很好的解决方案。您必须覆盖UISearchBar,然后同时隐藏Background和Segment Control图层。然后绘制背景。

@ .m

#import "UISearchBar.h" 
#import <QuartzCore/QuartzCore.h>

@implementation UISearchBar(CustomBackground)

- (id)init
    {
        for ( UIView * subview in self.subviews ) 
        {
            if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground") ] ) 
                subview.alpha = 0.0;  

            if ([subview isKindOfClass:NSClassFromString(@"UISegmentedControl") ] )
                subview.alpha = 0.0; 
        } 

        return self;
    }

+ (UIImage *) bgImagePortrait
    {
        static UIImage *image = nil;
        if (image == nil)
            image = [[UIImage imageNamed:@"UISearchBarBack.png"] retain ];

        return image;
    }

+ (UIImage *) bgImageLandscape
    {
        static UIImage *image = nil;
        if (image == nil)
            image = [[UIImage imageNamed:@"UISearchBarBack.png"] retain];

        return image;
    }

- (void) drawLayer:(CALayer *)layer inContext:(CGContextRef)contenxt
    {
        if ([self isMemberOfClass:[UISearchBar class]] == NO)
            return; 

        UIImage * image = ( self.frame.size.width > 320 ) ? [UISearchBar bgImageLandscape ] : [UISearchBar bgImagePortrait ];  

        for ( UIView * subview in self.subviews ) {
            if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground") ] ) 
                subview.alpha = 0.0; 

            if ([subview isKindOfClass:NSClassFromString(@"UISegmentedControl") ] )
                subview.alpha = 0.0; 
        }

        CGContextTranslateCTM( contenxt , 0 , image.size.height );
        CGContextScaleCTM( contenxt, 1.0, -1.0 );
        CGContextDrawImage( contenxt , CGRectMake( 0 , 0 , image.size.width , image.size.height ), image.CGImage );
    }  

@end

@ 。H

#import <Foundation/Foundation.h>
#import <QuartzCore/QuartzCore.h>


@interface UISearchBar(CustomBackground) 

@end

希望这可以帮助!

面向未来的方法:

[searchBar setBackgroundImage:[UIImage new]];
[searchBar setTranslucent:YES];

mj_有我使用的答案。我只是想这样评论,但我还不能。因此,我将在实现中发布自己的答案,在其中将搜索栏添加到具有半透明BG的表格视图的顶部。

DLog(@"    Add search bar to table view"); 

//could be a UIImageView to display an image..?
bg = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 45)] autorelease];
bg.backgroundColor        = [UIColor blackColor];
UISearchBar *sb           = [[[UISearchBar alloc]initWithFrame:CGRectMake(0, 0, 290, 45)] autorelease];
sb.barStyle               = UIBarStyleBlackTranslucent;
sb.showsCancelButton      = NO;
sb.autocorrectionType     = UITextAutocorrectionTypeNo;
sb.autocapitalizationType = UITextAutocapitalizationTypeNone;
sb.delegate               = self;
[bg addSubview:sb];
table.tableHeaderView     = bg;

for (UIView *subview in sb.subviews) {
    if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {
        [subview removeFromSuperview];
        break;
    }
}   

我上面的答案有问题。我使用了以下内容。

for (UIView *subview in searchBar.subviews) {
    if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {
        [subview removeFromSuperview];
        break;
    }
}

这对我有用(ios4.2 +)

// Change the search bar background
-(void)viewWillAppear:(BOOL)animated {
    for (UIView *subview in self.searchBar.subviews) {
        if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {
            UIView *bg = [[UIView alloc] initWithFrame:subview.frame];
            bg.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"search_bar_bg"]];
            [self.searchBar insertSubview:bg aboveSubview:subview];
            [subview removeFromSuperview];
            break;
        }
    }   
}

您在这里有两个问题:

1.UISearchBar的背景色清晰:

请在此处查看我的答案

2.设置背景图片解决方案:(如果您使用的是iOS 5.0 +

[[UISearchBar appearance]setSearchFieldBackgroundImage:[navBarGradImage resizableImageWithCapInsets:inset2] forState:UIControlStateNormal];

注意:您也可以尝试使用透明图像作为背景。

希望这可以帮助。

我更喜欢将alpha设置为0,以便您可以按需隐藏/显示。

// Hide
[[self.theSearchBar.subviews objectAtIndex:0] setAlpha:0.0];

// Show
[[self.theSearchBar.subviews objectAtIndex:0] setAlpha:1.0];

如何在UISearchBar中设置背景颜色:

#import <QuartzCore/QuartzCore.h>

然后与搜索栏建立出口连接(例如objSearchbar),并使用以下几行:

for (UIView *subview in self.objSearchbar.subviews) 
{
    if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) 
    {
        [subview removeFromSuperview];
        break;
    }
}

self.tweetSearchbar.layer.backgroundColor = [UIColor blueColor].CGColor;

searchBar.searchBarStyle = UISearchBarStyleMinimal;

在这里查看:UISearchbar背景图片更改

随着iOS8 sdks苹果移至@“ UISearchBarBackground”视图更深的一层,因此必须将子视图的子视图视为波纹管,

for (UIView *subview in searchBar.subviews) {
        for(UIView* grandSonView in subview.subviews){
            if ([grandSonView isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {
                grandSonView.alpha = 0.0f;
            }else if([grandSonView isKindOfClass:NSClassFromString(@"UISearchBarTextField")] ){
                NSLog(@"Keep textfiedld bkg color");
            }else{
                grandSonView.alpha = 0.0f;
            }
        }//for cacheViews
    }//subviews

设置背景图片

    UIImageView *backgroundView = [[UIImageView alloc] initWithFrame:searchBar.bounds];
    backgroundView.image = [UIImage imageNamed:@"xxxx.png"];
    [searchBar insertSubview:backgroundView atIndex:1]; // at index 1 but not 0
    [backgroundView release];

一班轮:

[[self.theSearchBar.subviews objectAtIndex:0] removeFromSuperview];
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