Objective c GCD滚动视图加载问题

我正在使用GCD为我的滚动视图加载图像，但它没有跟随我创建的帧，而是只生成一个帧，其中图像只是在其中闪烁。这是我的密码：

//Create the array    
-(void)awakeFromNib {

images = [NSMutableArray arrayWithObjects: [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"imageOne" ofType:@"png"]], [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"imageTwo" ofType:@"png"]], [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"imageThree" ofType:@"png"]],nil];

}

 //Populate scrollview
-(void)populate {

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);


scrollview.pagingEnabled = YES;
scrollview.backgroundColor = [UIColor clearColor];
scrollview.clipsToBounds = YES;
scrollview.delegate = self;

[scrollview setContentSize:CGSizeMake(2 * scrollview.frame.size.width, scrollview.frame.size.height)];

int number = [images count] ;
NSLog(@"%i",images);

int rowTwoInt = 0;
int rowThreeInt = 0;
int rowFourInt = 0;

for (int i = 0; i < number; i++) {



    if (i <= 3) {

        finalFrame = CGRectMake( i*(80), 12, 80, 80);
    }

    if (i == 4) {
        finalFrame = CGRectMake(0, 95, 80, 80);
    }
    if ((i >4) && (i <= 7)) {
        rowTwoInt = rowTwoInt + 80;
        finalFrame = CGRectMake(rowTwoInt, 95, 80, 80);
    }

    if (i == 8) {
         finalFrame = CGRectMake(0, 178, 80, 80);
    }
    if ((i > 8) && (i <= 11)) {
        rowThreeInt = rowThreeInt + 80;
        finalFrame = CGRectMake(rowThreeInt, 178, 80, 80);
    }


    if (i == 12) {
        finalFrame = CGRectMake(0, 261, 80, 80);
    }
    if ((i > 12) && (i <= 15)) {
        rowFourInt = rowFourInt + 80;
        finalFrame = CGRectMake(rowFourInt, 261, 80, 80);
    }


    IconButton = [UIButton buttonWithType:UIButtonTypeCustom];
    IconButton.frame = CGRectMake(0, 0, 57, 57);
    IconButton.center = CGPointMake(40, 29);

    [IconButton addTarget:self action:@selector(Selected:) forControlEvents:UIControlEventTouchUpInside];
    IconButton.tag = i;



    dispatch_async(queue, ^{
        UIImage *icon = [images objectAtIndex:i];

        dispatch_sync(dispatch_get_main_queue(), ^{
            [IconButton setImage:icon forState:UIControlStateNormal];

        });
    });



    [cell addSubview:IconButton];


      cell = [[UIView alloc] initWithFrame:finalFrame];
 [scrollview addSubview:cell];

//创建数组
-（无效）从NIB中唤醒{
images=[NSMutableArray Array WithObjects:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@“png”类型的“imageOne”，[UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@“png”类型的“imageTwo”]，[UIImage imageWithContentsOfFile:[NSBundle mainBundle]pathForResource:@“png”类型的“imageTwo:@“png”]，无]；
}
//填充滚动视图
-（空）填充{
调度队列=调度获取全局队列（调度队列优先级高，0ul）；
scrollview.PaginEnabled=是；
scrollview.backgroundColor=[UIColor clearColor]；
scrollview.clipsToBounds=是；
scrollview.delegate=self；
[scrollview setContentSize:CGSizeMake（2*scrollview.frame.size.width，scrollview.frame.size.height）]；
整数=[图像计数]；
NSLog（@“%i”，图像）；
int rowTwoInt=0；
int-rowtreeint=0；
int rowFourInt=0；
for（int i=0；i如果（I4）&（I8）&（I12）&（i我怀疑您已将
IconButton
声明为实例变量、
static
变量或全局变量

每次通过循环时，您都会更改
IconButton
的值。在十二个队列块执行时，
IconButton
被设置为其最终值-对您创建的最后一个按钮的引用。所有块都使用实例（或
static
或global）
IconButton
变量，因此所有块更新相同的最终按钮

创建一个局部变量以引用按钮，并在循环中使用该局部变量：

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
IconButton = button;
IconButton.frame = CGRectMake(0, 0, 57, 57);
...

dispatch_async(queue, ^{
    UIImage *icon = [images objectAtIndex:i];

    dispatch_sync(dispatch_get_main_queue(), ^{
        [button setImage:icon forState:UIControlStateNormal];

    });
});

每个块将在创建块时捕获局部变量的值，因此每个块将捕获对不同按钮的引用。
请将代码正确缩进。另外，向我们展示如何声明
IconButton
。