internal compiler error: Bus error: 10

Question

I have written code for an animation that shakes a UIImageView on the screen, but although the syntax seems to be correct, I am getting an obscure "internal compiler error: Bus error: 10" when building. Any idea why?

-(IBAction)shakeCircle{
 int d = 3;
 [UIView animateWithDuration:0.05
 animations:^{myCircle.center = CGPointMake(myCircle.center.x+d, myCircle.center.y-d);}
 completion:^(BOOL finished){
 [UIView animateWithDuration:0.05
 animations:^{myCircle.center = CGPointMake(myCircle.center.x-d, myCircle.center.y+d);}
 completion:^(BOOL finished)
 {
 //but if I comment from here..
 [UIView animateWithDuration:0.05
 animations:^{myCircle.center = CGPointMake(myCircle.center.x+d, myCircle.center.y-d);}
 completion:^(BOOL finished){
 [UIView animateWithDuration:0.05
 animations:^{myCircle.center = CGPointMake(myCircle.center.x-d, myCircle.center.y+d);}
 ];
 }
 ];
 //... to here the code will build.
 }
 ];
 }
 ];
}

Note that if I comment out the last five lines of animation code, everything compiles fine.... What is going on?

I have tried switching to different compilers, that didn't work. I made sure that there's just one myCircle and that the only time it ever gets referred to is when it gets declared, and in that method!

• Nick Bull: Is the search function on StackOverflow and/or Google broken? stackoverflow.com/questions/7035640/…
• Eric: Mr Bull, I took a look at similar questions before posting, I think the root of my problem is different.
• Nick Bull: Would be helpful if you edited your question and told people what you have tried...

Answer 1

Here's a little workaround that solves the problem through recursive calls to the function. Assign to int d the amount by which to shake, then

int d = 3;
-(IBAction)shakeMyCircle{
 [UIView animateWithDuration:0.05
 animations:^{myCircle.center = CGPointMake(myCircle.center.x+3, myCircle.center.y-3);}
 completion:^(BOOL finished){
 [UIView animateWithDuration:0.05
 animations:^{myCircle.center = CGPointMake(myCircle.center.x-3, myCircle.center.y+3);}
 completion:^(BOOL finished) 
 { 
 d--;
 if(d>0) [self shakemyCircle];
 if(d == 0) d = 3;
 }
 ];
 }
 ];
}