Ah, I guess I will make a tutorial soon on how to integrate this with theos. 
  
@@extractor304 
  
 
  
So first of all, you will need the headers from GitHub. Download them and add them in /theos/include/SCLAlertView/ 
  
Next, start a new project and then open your Makefile and add: 
  
  
ARCHS = armv7 arm64
CFLAGS = -fobjc-arc # ARC is needed for SCLAlertView
include theos/makefiles/common.mk
TWEAK_NAME = YOURTWEAKNAMEHERE
YOURTWEAKNAMEHERE_FILES = Tweak.xm $(shell find $(THEOS)/include/SCLAlertView -name '*.m')
YOURTWEAKNAMEHERE_FRAMEWORKS = UIKit MessageUI Social QuartzCore CoreGraphics Foundation AVFoundation Accelerate GLKit AudioToolbox
YOURTWEAKNAMEHERE_LDFLAGS += -Wl,-segalign,4000
Then in your Tweak.xm: 
#import <SCLAlertView/SCLAlertView.h> // Imports the popup headers.
%hook UnityAppController
- (BOOL)application:(id)fp8 didFinishLaunchingWithOptions:(id)fp12 { // Popup only once at each launch of the app.
    SCLAlertView *alert = [[SCLAlertView alloc] initWithNewWindow];
    
    [alert showSuccess: @"Title here"// Success, Error, Notice, Warning, Info, Edit, Custom, Waiting
              subTitle: @"Subtitle here"
      closeButtonTitle: @"Close button"
              duration: 0.0f];
		return %orig;
}
%end
Compile and it should work.