CODEWITHSUNDEEP
objective-cmethodscgrect
pterandon
pterandon

Reputation: 1816

Calling a complicated method from another method in Objective C

I've seen many cases here where someone asks how to call one extremely simply-named method from another method, and gets a simple answer.

However, I have a CGRect method

- (void)drawRect:(CGRect)rect { /* code that draws circles */}

which successfully draws nmax circles for me. I also have a button method that successfully updates an "nmax" displayed on the screen. 

- (IBAction)changeIntValue:(id)sender {nmax=nmax+100;}

Only problem is that I want it to redraw the screen for me as well. I cannot for the life of me figure out, even after Ring some FM's, the syntax to "re-call" this rect down again in my changeIntValue method.

Any help greatly appreciated. While I'm typing, if anyone has a reference with exhaustive info on syntax, that would be helpful. References at developer.apple.com and most tutorials veer off into giving specific examples likeThisExample. I hand-wrote some notes off a youtube lecture which gave syntax, but lost the reference.

Upvotes: 0

Views: 71

Answers (1)

craigmj
craigmj

Reputation: 5077

You can cause an item to redraw using 

[view setNeedsDisplay];

where view is obviously your view. This causes the view to be redrawn in the UI thread, and your view drawing code should then call your drawRect methods as appropriate.

Upvotes: 1

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