是否可以为UIToolBar提供自定义背景图片而非通常的淡蓝色/黑色渐变色?
我已经尝试给视图设置背景并设置UIToolBar的不透明度,但这也会影响其上的任何UIBarButton的不透明度。
在这里回答自己的问题!!! 覆盖drawRect函数并创建UIToolbar的实现即可解决问题 :)
@implementation UIToolbar (CustomImage)
- (void)drawRect:(CGRect)rect {
UIImage *image = [UIImage imageNamed: @"nm010400.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
@end
UIToolbar继承自UIView。这个对我来说很有效:
[topBar insertSubview:[[[UIImageView alloc] initWithImage:[UIImage imageNamed:BAR_BKG_IMG]] autorelease] atIndex:0];
这是对loerto答案的稍作修改,在iOS 4和5上对我有效:
// Set the background of a toolbar
+(void)setToolbarBack:(NSString*)bgFilename toolbar:(UIToolbar*)toolbar {
// Add Custom Toolbar
UIImageView *iv = [[UIImageView alloc] initWithImage:[UIImage imageNamed:bgFilename]];
iv.frame = CGRectMake(0, 0, toolbar.frame.size.width, toolbar.frame.size.height);
iv.autoresizingMask = UIViewAutoresizingFlexibleWidth;
// Add the tab bar controller's view to the window and display.
if([[[UIDevice currentDevice] systemVersion] intValue] >= 5)
[toolbar insertSubview:iv atIndex:1]; // iOS5 atIndex:1
else
[toolbar insertSubview:iv atIndex:0]; // iOS4 atIndex:0
toolbar.backgroundColor = [UIColor clearColor];
}
这是我用于iOS 4和5兼容性的方法:
if ([toolbar respondsToSelector:@selector(setBackgroundImage:forToolbarPosition:barMetrics:)]) {
[toolbar setBackgroundImage:[UIImage imageNamed:@"toolbar-background"] forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsDefault];
} else {
[toolbar insertSubview:[[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"toolbar-background"]] autorelease] atIndex:0];
}
-(void)viewDidLoad{}
中即可。[toolBarName setBackgroundImage:[UIImage imageNamed:@"imageName.png"] forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsDefault];
如果您使用idimmu的答案,并希望您的barbuttonitems具有颜色而不是默认值,您还可以将以下几行代码添加到您的类别中:
UIColor *color = [UIColor redColor];
self.tintColor = color;
自iOS5起,您可以使用外观API:
[[UIToolbar appearance] setBackgroundImage:[UIImage imageNamed:@"navbar_bg"] forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsDefault];
-(void) addCustomToolbar {
// Add Custom Toolbar
UIImageView *img = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"customToolbar.png"]];
img.frame = CGRectMake(-2, -20, img.frame.size.width+4, img.frame.size.height);
// Add the tab bar controller's view to the window and display.
if( SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO( @"5.0" ) )
[self.tabBarController.tabBar insertSubview:img atIndex:1]; // iOS5 atIndex:1
else
[self.tabBarController.tabBar insertSubview:img atIndex:0]; // iOS4 atIndex:0
self.tabBarController.tabBar.backgroundColor = [UIColor clearColor];
// Override point for customization after application launch.
[self.window addSubview:tabBarController.view];
}
这一个对我来说很好用:
ToolbarOptions *tbar = [[ToolbarOptions alloc] init];
[tbar setToolbarBack:@"footer_bg.png" toolbar:self.toolbarForPicker];
[tbar release];
#import <Foundation/Foundation.h>
@interface ToolbarOptions : NSObject {
}
-(void)setToolbarBack:(NSString*)bgFilename toolbar:(UIToolbar*)toolbar;
@end
#import "ToolbarOptions.h"
@implementation ToolbarOptions
-(void)setToolbarBack:(NSString*)bgFilename toolbar:(UIToolbar*)bottombar {
// Add Custom Toolbar
UIImageView *iv = [[UIImageView alloc] initWithImage:[UIImage imageNamed:bgFilename]];
iv.frame = CGRectMake(0, 0, bottombar.frame.size.width, bottombar.frame.size.height);
iv.autoresizingMask = UIViewAutoresizingFlexibleWidth;
// Add the tab bar controller's view to the window and display.
if([[[UIDevice currentDevice] systemVersion] intValue] >= 5)
[bottombar insertSubview:iv atIndex:1]; // iOS5 atIndex:1
else
[bottombar insertSubview:iv atIndex:0]; // iOS4 atIndex:0
bottombar.backgroundColor = [UIColor clearColor];
}
@end
您可以使用一种类别来实现这个功能,它基本上为UIToolBar添加了一个新属性。覆盖drawRect
可能有效,但不一定是未来的解决方案。同样的策略用于自定义UINavigationBar
在iOS 6中停止工作。
以下是我的做法。
@interface UIToolbar (CustomToolbar)
@property (nonatomic, strong) UIView *customBackgroundView;
@end
#import "CustomToolbar.h" #import
static char TIToolbarCustomBackgroundImage;
@implementation UIToolbar (CustomToolbar)
- (void)setCustomBackgroundView:(UIView *)newView { UIView *oldBackgroundView = [self customBackgroundView]; [oldBackgroundView removeFromSuperview];
[self willChangeValueForKey:@"tfCustomBackgroundView"]; objc_setAssociatedObject(self, &TIToolbarCustomBackgroundImage, newView, OBJC_ASSOCIATION_RETAIN); [self didChangeValueForKey:@"tfCustomBackgroundView"];
if (newView != nil) { [self addSubview:newView]; } }
- (UIView *)customBackgroundView { UIView *customBackgroundView = objc_getAssociatedObject(self, &TIToolbarCustomBackgroundImage);
return customBackgroundView; }
@end
viewDidLoad
if (self.navigationController.toolbar.customBackgroundView == nil) { self.navigationController.toolbar.customBackgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"navigation_bar_background.png"]]; self.navigationController.toolbar.customBackgroundView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth; }
drawInRect:self.bounds
会怎样? - user142019