为什么我自己将UIScrollView 和 UIPageControl 组合的MyView 不能拖拽

我自定义的MyView

• (instancetype)initWithImageList:(NSArray*) imgArr andFrame:(CGRect) frame { self = [super init]; self.userInteractionEnabled = YES; if (self) { [self createScrollView:imgArr andFrame:frame]; [self createPageControl:imgArr andFrame:CGRectMake(0, frame.size.height-40, frame.size.width, 30)];//创建pageController并且 设置位置 } return self; }

-(void) createScrollView:(NSArray*) imgArr andFrame:(CGRect) frame
{
self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
self.scrollView.contentSize = CGSizeMake(frame.size.width*(imgArr.count+2), frame.size.height);//多加2个图片的宽度
self.scrollView.pagingEnabled = YES;
self.scrollView.scrollEnabled = YES;
self.scrollView.userInteractionEnabled = YES;
int count = imgArr.count+1;
for (int i = -1; i < count; i++) {
UIImageView *imgV = [[UIImageView alloc] initWithFrame:CGRectMake(frame.size.width*i, 0, frame.size.width, frame.size.height)];
imgV.userInteractionEnabled = YES;
if(i==-1)
{
imgV.image= [UIImage imageNamed:imgArr[imgArr.count-1]];//增加最后一张图片作为第一个滚动的图片 实现无缝
}
else if (i==imgArr.count)
{
imgV.image= [UIImage imageNamed:imgArr[0]];//增加第一张图片作为最后一个滚动的图片 实现无缝
}
else
{
imgV.image= [UIImage imageNamed:imgArr[i]];
}
[self.scrollView addSubview:imgV];
}

[self addSubview:self.scrollView];

}

-(void) createPageControl:(NSArray*) imgArr andFrame:(CGRect) frame
{
self.pageControl = [[UIPageControl alloc] initWithFrame:frame];
self.pageControl.numberOfPages = imgArr.count;
self.pageControl.currentPage = 0;
[self addSubview:self.pageControl];
}

在UIViewController里面 我是这么写的

• (void)viewDidLoad { [super viewDidLoad]; NSArray *imgArr = @[@"welcome_01.png",@"welcome_02.png",@"welcome_03.png",@"welcome_04.png"]; self.scrollView = [[ScrollPageView alloc] initWithImageList:imgArr andFrame: CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)]; [self.view addSubview:self.scrollView]; // Do any additional setup after loading the view, typically from a nib. }

是我自己有点呆了 在初始化的时候 没加上 self.frame = frame;

http://blog.csdn.net/chenyong05314/article/details/8161492