冒泡排序

NSMutableArray *array = [NSMutableArray arrayWithArray:@[@"3",@"1",@"10",@"5",@"2",@"7",@"12",@"4",@"8"]];

for (int i =
0; i < array.count; i ++) {

for (int j =
0; j < array.count -
1 - i; j++) {

if([[array objectAtIndex:j] integerValue] > [[array objectAtIndex:j +
1] integerValue]) {
[array exchangeObjectAtIndex:j withObjectAtIndex:j +
1];
}
}
}
NSLog(@"%@", array);