忽略iOS: Accessibility中的动态类型

Question

有没有办法完全忽略iOS应用程序中的动态字体/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。我知道当设置发生变化时，我们可以观察和重新配置字体的通知。我正在寻找一种更简单的解决方案。我正在使用iOS8。谢谢。

Answer 1

没有必要对UIApplication信口开河。只需将UIApplication子类化并提供您自己的preferredContentSizeCategory实现

Swift：

class MyApplication: UIApplication {

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

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

Objective-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

在您的AppDelegate中添加：

#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

只需向@gebirgsbärbel answer提供Swift 4修复即可。Objective-C中的"preferredContentSizeCategory“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
    }
}