for subView in searchBar.subviews {
if let scopeBar = subView as? UISegmentedControl {
scopeBar.backgroundColor = UIColor.blueColor()
}
}
我一直在尝试上面的代码来尝试获取对 scopeBar 的引用并随后设置其背景颜色,但我无法获得引用。它似乎只循环一次,这意味着搜索栏只有一个子视图。 在调试器中,搜索栏似乎有一个名为 _scopeBar 的实例变量,其类型为 (UISegmentedControl *)。
if let topView = searchBar.subviews.first {
for subView in topView.subviews {
if let cancelButton = subView as? UIButton {
cancelButton.tintColor = UIColor.whiteColor()
cancelButton.enabled = true
}
}
}
第二个代码块用于访问搜索栏的取消按钮。
您可以将范围栏背景图像设置为纯色图像。
首先,您需要从颜色创建 UIImage。为此,您可以在 UIImage 上创建一个函数或扩展,例如以下代码:
斯威夫特 3
import UIKit
extension UIImage {
class func imageWithColor(color: UIColor) -> UIImage {
let rect: CGRect = CGRect(x: 0, y: 0, width: 1, height: 1)
UIGraphicsBeginImageContextWithOptions(CGSize(width: 1, height: 1), false, 0)
color.setFill()
UIRectFill(rect)
let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return image
}
}
之后,您只需在范围栏上设置背景图像:
斯威夫特 3
// Set the scopeBar's background color:
searchBar.scopeBarBackgroundImage = UIImage.imageWithColor(color: UIColor.blue)
我有一个示例问题,我按照下面的代码解决了这个问题。
CGSize imageSize = CGSizeMake(64, 64);
UIColor *fillColor = [UIColor colorWithRed:228/255.0 green:228/255.0 blue:228/255.0 alpha:1.0];
UIGraphicsBeginImageContextWithOptions(imageSize, YES, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
[fillColor setFill];
CGContextFillRect(context, CGRectMake(0, 0, imageSize.width, imageSize.height));
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.searchController.searchBar.scopeBarBackgroundImage = image;
- (void)changeScopeBarColor {
NSMutableArray<UIView*> *views = [NSMutableArray new];
NSArray<UIView *> *subviews = [_searchBar subviews];
[views addObjectsFromArray:subviews];
for (;;) {
if (views.count == 0) {
break;
}
UIView *v = [views firstObject];
[views removeObject:v];
if ([[[v class] description] isEqualToString:@"_UISearchBarScopeBarBackground"]) {
v.backgroundColor = [UIColor whiteColor];
break;
}
if (v.subviews.count > 0)
[views addObjectsFromArray:v.subviews];
}
}