How to change UIAlertController button text colour in iOS9?

Question

The question is similar to iOS 8 UIActivityViewController and UIAlertController button text color uses window's tintColor but in iOS 9.

I have a UIAlertControlle

Answer 1

I found a solution to this. Not an elegant solution, but a solution.

I swizzled viewWillAppear: on UIAlertController, then looped through the views and modified the tint color. In my case I had a tintColor set on the entire window and despite setting the tintColor via appearance the UIAlertController maintained the color on the window. I check if the color is equal to that of the window and if so apply a new one. Blindly applying the tintColor to all views will result in the red tint on destructive actions to be reset.

+ (void)load  
{  
    static dispatch_once_t onceToken;  
    dispatch_once(&onceToken, ^{  
        Method swizzleMethod = class_getInstanceMethod(self, @selector(viewWillAppear:));  
        Method method = class_getInstanceMethod(self, @selector(alertSwizzle_viewWillAppear:));  
        method_exchangeImplementations(method, swizzleMethod);  
    });  
}  

- (void)alertSwizzle_viewWillAppear:(BOOL)animated  
{  
    [self alertSwizzle_viewWillAppear:animated];  
    [self applyTintToView:self.view];  
}  

- (void)applyTintToView:(UIView *)view  
{  
    UIWindow *mainWindow = [UIApplication sharedApplication].keyWindow;  

    for (UIView *v in view.subviews) {  
        if ([v.tintColor isEqual:mainWindow.tintColor]) {  
            v.tintColor = [UIColor greenColor];  
        }  
        [self applyTintToView:v];  
    }  
}  

However this doesn't work on iOS 8, so you'll still need to set the apperance tint color.

[[UIView appearanceWhenContainedIn:[UIAlertController class], nil] setTintColor:[UIColor greenColor]];  

Answer 2

You have 3 styles for the action buttons:

let style : UIAlertActionStyle = .default
// default, cancel (bold) or destructive (red)

let alertCtrl = UIAlertController(....)
alertCtrl.addAction( UIAlertAction(title: "click me", style: style, handler: {
    _ in doWhatever()
}))