Simple category that wraps around the UIAlertController annoying stuff

UIAlertController+Utilities.h

//
//  UIAlertController+Utilities.h
//
//  Created by valvoline on 18/12/14.
//  Copyright (c) 2014 sofapps. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIAlertController (Utilities)


+ (UIAlertController*)alertControllerWithTitle:(NSString *)aTitle
                                       message:(NSString *)aMessage
                                       actions:(UIAlertAction *)cancelAct,...;


+ (UIAlertController*)sheetControllerWithTitle:(NSString *)aTitle
                                       message:(NSString *)aMessage
                                       actions:(UIAlertAction *)cancelAct, ...;

@end

UIAlertController+Utilities.m

//
//  UIAlertController+Utilities.m
//
//  Created by valvoline on 18/12/14.
//  Copyright (c) 2014 sofapps. All rights reserved.
//

#import "UIAlertController+Utilities.h"

@implementation UIAlertController (Utilities)

+ (UIAlertController*)alertControllerWithTitle:(NSString *)aTitle
                                       message:(NSString *)aMessage
                                  actions:(UIAlertAction *)cancelAct, ...
{
    va_list args;
    va_start(args, cancelAct);
    
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:aTitle
                                                                   message:aMessage
                                                            preferredStyle:UIAlertControllerStyleAlert];
    
    for (UIAlertAction *anAct = cancelAct; anAct != nil; anAct = va_arg(args, UIAlertAction*))
    {
        [alert addAction:anAct];
    }
    va_end(args);
    return alert;
}


+ (UIAlertController*)sheetControllerWithTitle:(NSString *)aTitle
                                       message:(NSString *)aMessage
                                       actions:(UIAlertAction *)cancelAct, ...
{
    va_list args;
    va_start(args, cancelAct);
    
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:aTitle
                                                                   message:aMessage
                                                            preferredStyle:UIAlertControllerStyleActionSheet];
    
    for (UIAlertAction *anAct = cancelAct; anAct != nil; anAct = va_arg(args, UIAlertAction*))
    {
        [alert addAction:anAct];
    }
    va_end(args);
    return alert;
}

@end

UIAlertController+Window Example.m

//http://stackoverflow.com/a/30941356/2895831

// need local variable for TextField to prevent retain cycle of Alert otherwise UIWindow
// would not disappear after the Alert was dismissed
__block UITextField *localTextField;
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Global Alert" message:@"Enter some text" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
    NSLog(@"do something with text:%@", localTextField.text);
// do NOT use alert.textfields or otherwise reference the alert in the block. Will cause retain cycle
}]];
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
    localTextField = textField;
}];
[alert show];

//https://github.com/agilityvision/FFGlobalAlertController

UIAlertController+Window.m

//http://stackoverflow.com/a/30941356/2895831

#import "UIAlertController+Window.h"
#import <objc/runtime.h>

@interface UIAlertController (Window)

- (void)show;
- (void)show:(BOOL)animated;

@end

@interface UIAlertController (Private)

@property (nonatomic, strong) UIWindow *alertWindow;

@end

@implementation UIAlertController (Private)

@dynamic alertWindow;

- (void)setAlertWindow:(UIWindow *)alertWindow {
    objc_setAssociatedObject(self, @selector(alertWindow), alertWindow, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (UIWindow *)alertWindow {
    return objc_getAssociatedObject(self, @selector(alertWindow));
}

@end

@implementation UIAlertController (Window)

- (void)show {
    [self show:YES];
}

- (void)show:(BOOL)animated {
    self.alertWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.alertWindow.rootViewController = [[UIViewController alloc] init];

    id<UIApplicationDelegate> delegate = [UIApplication sharedApplication].delegate;
    // Applications that does not load with UIMainStoryboardFile might not have a window property:
    if ([delegate respondsToSelector:@selector(window)]) {
        // we inherit the main window's tintColor
        self.alertWindow.tintColor = delegate.window.tintColor;
    }

    // window level is above the top window (this makes the alert, if it's a sheet, show over the keyboard)
    UIWindow *topWindow = [UIApplication sharedApplication].windows.lastObject;
    self.alertWindow.windowLevel = topWindow.windowLevel + 1;

    [self.alertWindow makeKeyAndVisible];
    [self.alertWindow.rootViewController presentViewController:self animated:animated completion:nil];
}

- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];

    // precaution to insure window gets destroyed
    self.alertWindow.hidden = YES;
    self.alertWindow = nil;
}

@end