在iOS 13中,模态视图控制器在呈现时有一个新的行为。
现在它不是全屏默认情况下,当我向下滑动时,应用会自动解除视图控制器。
我怎么能防止这种行为,并回到旧的全屏模态vc?
谢谢
在iOS 13中,模态视图控制器在呈现时有一个新的行为。
现在它不是全屏默认情况下,当我向下滑动时,应用会自动解除视图控制器。
我怎么能防止这种行为,并回到旧的全屏模态vc?
谢谢
当前回答
这是我在objective - c中使用类别的修复版本。使用这种方法,你将拥有默认的UIModalPresentationStyleFullScreen行为,直到另一个显式设置。
#import "UIViewController+Presentation.h"
#import "objc/runtime.h"
@implementation UIViewController (Presentation)
- (void)setModalPresentationStyle:(UIModalPresentationStyle)modalPresentationStyle {
[self setPrivateModalPresentationStyle:modalPresentationStyle];
}
-(UIModalPresentationStyle)modalPresentationStyle {
UIModalPresentationStyle style = [self privateModalPresentationStyle];
if (style == NSNotFound) {
return UIModalPresentationFullScreen;
}
return style;
}
- (void)setPrivateModalPresentationStyle:(UIModalPresentationStyle)modalPresentationStyle {
NSNumber *styleNumber = [NSNumber numberWithInteger:modalPresentationStyle];
objc_setAssociatedObject(self, @selector(privateModalPresentationStyle), styleNumber, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (UIModalPresentationStyle)privateModalPresentationStyle {
NSNumber *styleNumber = objc_getAssociatedObject(self, @selector(privateModalPresentationStyle));
if (styleNumber == nil) {
return NSNotFound;
}
return styleNumber.integerValue;
}
@end
其他回答
这是我在objective - c中使用类别的修复版本。使用这种方法,你将拥有默认的UIModalPresentationStyleFullScreen行为,直到另一个显式设置。
#import "UIViewController+Presentation.h"
#import "objc/runtime.h"
@implementation UIViewController (Presentation)
- (void)setModalPresentationStyle:(UIModalPresentationStyle)modalPresentationStyle {
[self setPrivateModalPresentationStyle:modalPresentationStyle];
}
-(UIModalPresentationStyle)modalPresentationStyle {
UIModalPresentationStyle style = [self privateModalPresentationStyle];
if (style == NSNotFound) {
return UIModalPresentationFullScreen;
}
return style;
}
- (void)setPrivateModalPresentationStyle:(UIModalPresentationStyle)modalPresentationStyle {
NSNumber *styleNumber = [NSNumber numberWithInteger:modalPresentationStyle];
objc_setAssociatedObject(self, @selector(privateModalPresentationStyle), styleNumber, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (UIModalPresentationStyle)privateModalPresentationStyle {
NSNumber *styleNumber = objc_getAssociatedObject(self, @selector(privateModalPresentationStyle));
if (styleNumber == nil) {
return NSNotFound;
}
return styleNumber.integerValue;
}
@end
这很容易做到 打开你的故事板作为源代码,搜索kind="presentation",在所有带有kind= presentation的segue标签中添加一个额外的属性modalPresentationStyle="fullScreen"
最初,modalPresentationStyle的默认值是全屏,但在iOS 13中,它的变化是UIModalPresentationStyle.automatic。
如果你想要创建全屏视图控制器,你必须将modalPresentationStyle更改为fullScreen。
参考UIModalPresentationStyle苹果文档了解更多细节,并参考苹果人机界面指南了解应该在哪里使用哪种模式。
我在ios 13中使用了swizzling
import Foundation
import UIKit
private func _swizzling(forClass: AnyClass, originalSelector: Selector, swizzledSelector: Selector) {
if let originalMethod = class_getInstanceMethod(forClass, originalSelector),
let swizzledMethod = class_getInstanceMethod(forClass, swizzledSelector) {
method_exchangeImplementations(originalMethod, swizzledMethod)
}
}
extension UIViewController {
static let preventPageSheetPresentation: Void = {
if #available(iOS 13, *) {
_swizzling(forClass: UIViewController.self,
originalSelector: #selector(present(_: animated: completion:)),
swizzledSelector: #selector(_swizzledPresent(_: animated: completion:)))
}
}()
@available(iOS 13.0, *)
@objc private func _swizzledPresent(_ viewControllerToPresent: UIViewController,
animated flag: Bool,
completion: (() -> Void)? = nil) {
if viewControllerToPresent.modalPresentationStyle == .pageSheet
|| viewControllerToPresent.modalPresentationStyle == .automatic {
viewControllerToPresent.modalPresentationStyle = .fullScreen
}
_swizzledPresent(viewControllerToPresent, animated: flag, completion: completion)
}
}
然后放这个
UIViewController.preventPageSheetPresentation
的某个地方
例如在AppDelegate中
func application(_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]?) -> Bool {
UIViewController.preventPageSheetPresentation
// ...
return true
}
对于Objective-C用户
只需使用这段代码
[vc setModalPresentationStyle: UIModalPresentationFullScreen];
或者如果你想在iOS 13.0中添加它,那么使用
if (@available(iOS 13.0, *)) {
[vc setModalPresentationStyle: UIModalPresentationFullScreen];
} else {
// Fallback on earlier versions
}