iOS: incompatibile block pointer types

Question

This code:

[UIView animateWithDuration:0.25f animations:^() {
 self.view.alpha = 1.0f;
}];

is generating this compile time error:

Incompatible block pointer types initializing 'void (^)()', expected 'void (^)(void)'

What gives -- this has worked previously (and in fact compiles in other project just fine -- (I just checked). Is there a compiler/project setting that I've overlooked?

Base SDK is 4.2, deployment target is 4.2

Joshua Weinberg · Accepted Answer · 2010-12-23 20:39:58Z

7

Try declaring it as [UIView animateWithDuration:0.25f animations:^{ self.view.alpha = 1.0f; }];

The () is optional with no params, and may be confusing the parser. Which compiler are you using? I'd recommend LLVM, 1.6 I think is the latest version in XCode.

answered Dec 23, 2010 at 20:39

Joshua Weinberg

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5 Comments

TomH Over a year ago

Thanks -- changed to the LLVM compiler and it compiles (and runs)

TomH Over a year ago

And removing the () and using gcc works just fine too. Thanks again.

Joshua Weinberg Over a year ago

I'd still say use LLVM whenever possible (always)

JamesSugrue Over a year ago

Thanks I had an unrelated blocks issue and changing the compiler to LLVM fixed this. +1

Naveen Shan Over a year ago

I changed to Apple LLVM compiler 3.1 (default) now works fine +1

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