CODEWITHSUNDEEP
iosobjective-cios6
James Douglas
James Douglas

Reputation: 736

How to reload UIView?

I have an UIView Graph with main method and some other methods which draw various things. When the application starts, view is drawn fine and I have no problem with it. But when I try to use button (located on same UIView) to redraw something I just get error:

CGContextDrawPath: invalid context 0x0

button is not calling main drawRect method. Also if I try to use:

[self setNeedsDisplay:YES];

I get error:

No visible @interface for viewcontroller declares the selector 'setNeedsDisplay'

Upvotes: 3

Views: 8687

Answers (3)

Rost K.
Rost K.

Reputation: 262

Try to use this method

- (void)setNeedsLayout

setNeedsLayout from developer.apple.com

Upvotes: 1

Naresh Gunda
Naresh Gunda

Reputation: 332

setNeedsDisplay will not work for the subviews....it will work only for the View of a viewController

Upvotes: 5

Gabriele Petronella
Gabriele Petronella

Reputation: 108101

You are calling setNeedsDisplay on the UIViewController instance whereas you need to call it on its UIView.

[self.view setNeedsDisplay:YES];

Upvotes: 0

Related Questions