iOS - [UIColor clearColor] 和 UIToolbars

发布于 2024-12-02 15:53:22 字数 527 浏览 1 评论 0原文

我一直在尝试将 [UIColor clearColor] 与 UIToolbar 一起使用，试图使自定义控制界面更适合“机械”应用程序（想想您会看到的按钮）在 70 年代的电影中）。

发生的情况是，当我将工具栏设置为clearColor 时，它会将其变成哑光黑色。它后面的图像是红色、棕褐色和黑色的，所以我确信它没有按预期工作。

我发现的一个区别是我使用的是导航控制器上的工具栏，而不是独立的 UIToolbar。

代码行是

self.navigationController.toolbar.translucent = YES;
self.navigationController.toolbar.backgroundColor = [UIColor clearColor];

，我的上部导航栏（在另一个视图中设置）是 UIBarStyleBlackTranslucent，这可能会导致它失效吗？

任何帮助追踪这个问题都会很棒。

原文

I've been attempting to use [UIColor clearColor] with UIToolbar in an attempt to make a custom control interface more fitting of a "Mechanical" application (Think buttons you would see in a Movie from the 70s).

What is happening is that when I set the toolbar to clearColor it is turning it matte black. The image behind it is red, tan and black so I'm sure it's not working as intended.

One difference I see is that I'm using the toolbar on a nav controller and not a stand alone UIToolbar.

The lines of code are

self.navigationController.toolbar.translucent = YES;
self.navigationController.toolbar.backgroundColor = [UIColor clearColor];

and my upper navigation bar (that is setup in another view) is UIBarStyleBlackTranslucent, could this be throwing it off?

any help tracking this down would be great.

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半透明的墙 2024-12-09 15:53:22

您可以使用以下代码为导航控制器的工具栏设置透明背景：

// UIToolbar.h
@interface UIToolbar (Transparency)
- (void)drawRect:(CGRect)rect;
@end
// UIToolbar.m
#import "TransparentToolbar.h"
@implementation UIToolbar (Transparency)
- (void)drawRect:(CGRect)rect {
    [[UIColor clearColor] set];
    CGContextFillRect(UIGraphicsGetCurrentContext(), rect);
}
@end

用法：

// bar_bottom_bumped.png is a toolbar image with transparency
UIImage *bg = [UIImage imageNamed:@"bar_bottom_bumped.png"];
UIImageView *background = [[UIImageView alloc] initWithImage:bg];
background.frame = self.navigationController.toolbar.bounds;
background.autoresizingMask = UIViewAutoresizingFlexibleWidth;
BOOL isIOS5 = [[[UIDevice currentDevice] systemVersion] intValue] >= 5;
self.navigationController.toolbar.backgroundColor = [UIColor clearColor];
[self.navigationController.toolbar insertSubview:background atIndex: (isIOS5 ? 1 : 0)];

You can set a transparent background for the toolbar of your navigation controller with the following code:

// UIToolbar.h
@interface UIToolbar (Transparency)
- (void)drawRect:(CGRect)rect;
@end
// UIToolbar.m
#import "TransparentToolbar.h"
@implementation UIToolbar (Transparency)
- (void)drawRect:(CGRect)rect {
    [[UIColor clearColor] set];
    CGContextFillRect(UIGraphicsGetCurrentContext(), rect);
}
@end

Usage:

// bar_bottom_bumped.png is a toolbar image with transparency
UIImage *bg = [UIImage imageNamed:@"bar_bottom_bumped.png"];
UIImageView *background = [[UIImageView alloc] initWithImage:bg];
background.frame = self.navigationController.toolbar.bounds;
background.autoresizingMask = UIViewAutoresizingFlexibleWidth;
BOOL isIOS5 = [[[UIDevice currentDevice] systemVersion] intValue] >= 5;
self.navigationController.toolbar.backgroundColor = [UIColor clearColor];
[self.navigationController.toolbar insertSubview:background atIndex: (isIOS5 ? 1 : 0)];

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