iOS自帶懸浮窗除錯工具

[九九Tips]- http://www.jianshu.com/users/bab86b3e8aa3/latest_articles

參考的部落格：
https://wellphone.me/post/2017/use_uidebugginginformationoverlay_to_debug_ui/

使用步驟（簡化版）：

1. 先把檔案UIDebuggingInformationOverlay+Enable.m放在拖到工程裡,這個檔案內容放在文章的結尾處。

2. 在 didFinishLaunchingWithOptions方法中貼上下面一段程式碼

#ifdef DEBUG 
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
    id overlayClass = NSClassFromString(@"UIDebuggingInformationOverlay");
    [overlayClass performSelector:NSSelectorFromString(@"prepareDebuggingOverlay")];
#pragma clang diagnostic pop
    
#endif

3. 執行後，用兩個手指頭在狀態列上同時點選下就可以顯示出這個除錯的懸浮層。

執行效果

701B8D4445F947915AE73C70AA1E7FA0.png

你值得擁有~

下面的程式碼為附件檔案，請儲存為 UIDebuggingInformationOverlay+Enable.m 格式拖到工程目錄下：

#import <UIKit/UIKit.h>
#import <objc/runtime.h>


/*
 In iOS 11, Apple added additional checks to disable this overlay unless the
 device is an internal device. To get around this, we swizzle out the
 -[UIDebuggingInformationOverlay init] method (which returns nil now if
 the device is non-internal) and +[UIDebuggingInformationOverlay prepareDebuggingOverlay]
 method.
 
 Usage:
  1.Copy this file to your project.
  2.Add the following code to [AppDelegate application:didFinishLaunchingWithOptions:]
 
 #if DEBUG
 id overlayClass = NSClassFromString(@"UIDebuggingInformationOverlay");
 [overlayClass performSelector:NSSelectorFromString(@"prepareDebuggingOverlay")];
 #endif
 
 */


#if defined(DEBUG) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_11_0

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wincomplete-implementation"
#pragma clang diagnostic ignored "-Wundeclared-selector"
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"

@interface UIWindow (PrivateMethods)
- (void)_setWindowControlsStatusBarOrientation:(BOOL)orientation;
@end

@interface FakeWindowClass : UIWindow
@end

@implementation FakeWindowClass

- (instancetype)initSwizzled {
    self = [super init];
    if (self) {
        [self _setWindowControlsStatusBarOrientation:NO];
    }
    return self;
}

@end

@implementation NSObject (UIDebuggingInformationOverlayEnable)

+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Class cls = NSClassFromString(@"UIDebuggingInformationOverlay");
        [FakeWindowClass swizzleSelector:@selector(init) newSelector:@selector(initSwizzled) forClass:cls isClassMethod:NO];
        [self swizzleSelector:@selector(prepareDebuggingOverlay) newSelector:@selector(prepareDebuggingOverlaySwizzled) forClass:cls isClassMethod:YES];
    });
}

+ (void)swizzleSelector:(SEL)originalSelector newSelector:(SEL)swizzledSelector forClass:(Class)class isClassMethod:(BOOL)isClassMethod {
    Method originalMethod = NULL;
    Method swizzledMethod = NULL;
    
    if (isClassMethod) {
        originalMethod = class_getClassMethod(class, originalSelector);
        swizzledMethod = class_getClassMethod([self class], swizzledSelector);
    } else {
        originalMethod = class_getInstanceMethod(class, originalSelector);
        swizzledMethod = class_getInstanceMethod([self class], swizzledSelector);
    }
    method_exchangeImplementations(originalMethod, swizzledMethod);
}

+ (void)prepareDebuggingOverlaySwizzled {
    id overlayClass = NSClassFromString(@"UIDebuggingInformationOverlayInvokeGestureHandler");
    id handler = [overlayClass performSelector:NSSelectorFromString(@"mainHandler")];
  
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:handler action:@selector(_handleActivationGesture:)];
    tapGesture.numberOfTouchesRequired = 2;
    tapGesture.numberOfTapsRequired = 1;
    tapGesture.delegate = handler;
  
    UIView *statusBarWindow = [[UIApplication sharedApplication] valueForKey:@"statusBarWindow"];
    [statusBarWindow addGestureRecognizer:tapGesture];
}

@end
#pragma clang diagnostic pop

#endif