忽略 iOS 中的动态类型：可访问性

Question

有没有办法完全忽略 iOS 应用中的动态类型/字体大小设置？ 我的意思是有没有像 plist 条目这样的方法，这样我就可以完全禁用它。我知道有一个通知，我们可以在设置发生变化时观察并重新配置字体。我正在寻找一个更简单的解决方案。我正在使用iOS8。 谢谢。

Answer 1

没有必要调配UIApplication。只需继承 UIApplication 并提供您自己的 preferredContentSizeCategory 实现：

斯威夫特：

class MyApplication: UIApplication {

    override var preferredContentSizeCategory: UIContentSizeCategory {
        get { return UIContentSizeCategory.large }
    }
}

UIApplicationMain(
    CommandLine.argc,
    CommandLine.unsafeArgv,
    NSStringFromClass(MyApplication.self),
    NSStringFromClass(AppDelegate.self)
)

目标-C：

@interface MyApplication : UIApplication
@end

@implementation MyApplication

- (UIContentSizeCategory) preferredContentSizeCategory
{
    return UIContentSizeCategoryLarge;
}

@end

int main(int argc, char * argv[]) {
    @autoreleasepool {
        return UIApplicationMain(argc, argv, NSStringFromClass([MyApplication class]), NSStringFromClass([AppDelegate class]));
    }
}

Answer 2

在你的AppDelegate 添加：

#import <objc/runtime.h>

@implementation AppDelegate

NSString* swizzled_preferredContentSizeCategory(id self, SEL _cmd)
{
    return UIContentSizeCategoryLarge;  // Set category you prefer, Large being iOS' default.
}

- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
    Method method = class_getInstanceMethod([UIApplication class], @selector(preferredContentSizeCategory));
    method_setImplementation(method, (IMP)swizzled_preferredContentSizeCategory);

    ...
}

Answer 3

只需为@gebirgsbärbel 答案提供 Swift 4 修复。 “preferredContentSizeCategory”在 Objective-C 中是一个方法，但在 Swift 中它是一个只读变量。所以在你的 AppDelegate 中是这样的：

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    // MARK: - UIApplicationDelegate

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {

        UIApplication.classInit

        self.window = UIWindow(frame: UIScreen.main.bounds)
        ...
        self.window?.makeKeyAndVisible()
        return true
    }
}

// MARK: - Fix Dynamic Type

extension UIApplication {

    static let classInit: Void = {
        method_exchangeImplementations(
            class_getInstanceMethod(UIApplication.self, #selector(getter: fixedPreferredContentSizeCategory))!,
            class_getInstanceMethod(UIApplication.self, #selector(getter: preferredContentSizeCategory))!
        )
    }()

    @objc
    var fixedPreferredContentSizeCategory: UIContentSizeCategory {
        return .large
    }
}

Answer 4

相当于@meaning-matters 的答案的swift 如下所示：

在您的 AppDelegate 中：

@objc func swizzled_preferredContentSizeCategory() -> UIContentSizeCategory {
    return UIContentSizeCategory.small
}

open func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    let originalMethod = class_getInstanceMethod(UIApplication.self, #selector(preferredContentSizeCategory))
    let swizzledMethod = class_getInstanceMethod(UIApplication.self, #selector(swizzled_preferredContentSizeCategory))
    method_exchangeImplementations(originalMethod, swizzled_preferredContentSizeCategory)
}