这段代码给我造成了段错误,你有什么想法吗?
allButtons
是一个NSMutableArray
,它包含3个对象,a=0,b=1
,a和b都是int
类型。 if(a != -1 && b!= -1){
//Swap index in "allButtons"
id tempA = [allButtons objectAtIndex:a];
id tempB = [allButtons objectAtIndex:b];
[allButtons replaceObjectAtIndex:a withObject:tempB]; //Seg fault here?????
[allButtons replaceObjectAtIndex:b withObject:tempA];
needLoad = false;
[self setUpButtons];
}
编辑:
NSMutableArray *allButtons = //fetch the array from Coredata. This work since I display the data onto the screen, plus, [allButtons count] return 3, and a=0, b=1
f(a != -1 && b!= -1){
//Swap index in "allButtons"
[allButtons exchangeObjectAtIndex:a withObjectAtIndex:b];
needLoad = false;
[self setUpButtons];
}