-(void)RandomButtonImage {
NSMutableArray *images = [NSMutableArray arrayWithObjects:@"Character_1_1.png",@"Character_1_2.png",@"Character_2_1.png",@"Character_2_2.png" nil];
NSArray *Buttons = [NSArray arrayWithObjects:AnsButton1,AnsButton2,AnsButton3,AnsButton4, nil];
for (UIButton *btn in Buttons) {
int randomIndex = random() % images.count;
UIImage *img = [UIImage imageNamed:[images objectAtIndex:randomIndex]];
[btn setImage:img forState:UIControlStateNormal];
[images removeObjectAtIndex:randomIndex];//或者[images removeObjectsAtIndexes:[NSIndexSet indexSetWithIndex:randomIndex]];
}
}
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