CODEWITHSUNDEEP
iosuiscrollview
nickpan
nickpan

Reputation: 63

iOS add imageView to scrollView

enter image description hereWhen i add three imageViews to scrollView, and i setting scrollView contentSize is three times scrollView's width, even if it was appeared in scrolView,but imageView's width not equal to scrollview's. I ensured that already setting they width equeal to each otehr. If who know that how to resolve this issue,please help me, thinks. 

- (void)addScrollViewImage {
for (NSInteger index = 0; index < IMAGE_NUM; index++) {
    UIImageView *imageView = [[UIImageView alloc] init];
    CGFloat imageViewX = index * (self.scrollView.frame.size.width);
    imageView.frame = CGRectMake(imageViewX, 0, self.scrollView.frame.size.width , self.scrollView.frame.size.height);
    imageView.image = [UIImage imageNamed:@"搜索图片"];
    imageView.contentMode =  UIViewContentModeScaleAspectFill;
    [self.scrollView addSubview:imageView];
}
    self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * IMAGE_NUM, self.scrollView.frame.size.height);

}

Upvotes: 1

Views: 1361

Answers (2)

Borzh
Borzh

Reputation: 5215

This is because when your viewController is loaded, view / scrollView frame is still unknown.

You need to override viewDidLayoutSubviews() and setup children frames and content size there.

Important note: iOS is adding EXTRA UIImageView's for scroll indicators. That's why you can't use scrollView.subviews.count inside viewDidLayoutSubviews(), but you can use IMAGE_NUM though.

Some Swift code:

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    let scrollSize = scrollView.bounds.size
    var frame = scrollView.bounds

    // Wrong: for i in 0 ..< scrollView.subviews.count
    for i in 0 ..< IMAGE_NUM {
        let view = scrollView.subviews[i]
        view.frame = frame
        frame.origin.x += scrollSize.width
    }

    scrollView.contentSize = CGSize(width: frame.origin.x, height: scrollSize.height)
}

Upvotes: 0

KKRocks
KKRocks

Reputation: 8322

you need to change imageview content mode 

imageView.contentMode =  UIViewContentModeScaleAspectFill;

With

imageView.contentMode =  UIViewContentModeScaleToFill;

Upvotes: 1

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