IOS。 ScrollView只显示一个图像的子视图
我有一个UIScrollView，我想从flickr加载一个图像列表。 然后，我希望这些照片能够像原始股票iphone照片应用程序一样显示，以便在照片中滚动。
这是我的代码
- (void)viewDidLoad
{
[super viewDidLoad];
for (int i = 0; i < self.urlArray.count; i++) {
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
UIView *subview = [[UIView alloc] initWithFrame:frame];
[self returnImageFromFlickr:[self.urlArray objectAtIndex:i]];
UIImageView *imageView = self.largePhoto;
[subview addSubview:imageView];
[self.scrollView addSubview:subview];
}
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * self.urlArray.count, self.scrollView.frame.size.height);
}
-(void)returnImageFromFlickr:(NSURL *)url {
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
[self.largePhoto setImageWithURLRequest:request placeholderImage:[UIImage imageNamed:@"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
[self.largePhoto setImageWithURL:url placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
}];
}
正在显示的只是最后一张图片。
我根据自己的理解尝试了解决方案，并获得了这一点。 这不是摄影照片。 只是一个白色的屏幕。 加上returnImageFromFlicrk方法中的警告
[imageView setImageWithURL：url placeholderImage：[UIImage imageNamed：@“placeholder.png”]];
说在这个块中强烈捕获'imageView'可能会导致一个保留周期
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
/*for (int i = 0; i < self.urlArray.count; i++) {
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
UIView *subview = [[UIView alloc] initWithFrame:frame];
[self returnImageFromFlickr:[self.urlArray objectAtIndex:i]];
UIImageView *imageView = self.largePhoto;
[subview addSubview:imageView];
//subview.backgroundColor = [colors objectAtIndex:i];
[self.scrollView addSubview:subview];
}*/
for (int i = 0; i < self.urlArray.count; i++) {
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
UIImageView *imageView = [[UIImageView alloc] init];
[self returnImageFromFlickr:[self.urlArray objectAtIndex:i] imageview:imageView];
[self.scrollView addSubview:imageView];
}
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * self.urlArray.count, self.scrollView.frame.size.height);
}
-(void)returnImageFromFlickr:(NSURL *)url imageview:(UIImageView *)imageView {
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
[imageView setImageWithURLRequest:request placeholderImage:[UIImage imageNamed:@"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
[imageView setImageWithURL:url placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
}];
}
您没有为滚动内容平移设置正确的参数，这就是为什么您想要的所有图像都不在scrollView中显示的原因。 尝试更新ScrollView的内容平移以适应所有图像的宽度。 喜欢
self.scrollView.contentSize = CGSizeMake（Width，Height）;
在这种情况下，高度将是单幅图像的高度，宽度将是（单幅图像的宽度*图像的总数）
你覆盖self.largePhoto，你需要在returnImageFromFlickr中设置你的imageView
尝试这个
UIImageView *imageView = [[UIImageView alloc] init];
[self returnImageFromFlickr:[self.urlArray objectAtIndex:i] imageview:imageView];
和
-(void)returnImageFromFlickr:(NSURL *)url imageview:(UIImageView *)imageView {
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
[imageView setImageWithURLRequest:request placeholderImage:[UIImage imageNamed:@"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
[imageView setImage:image];
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
}];
}
我需要做的就是将代码从viewDidLoad移动到viewDidApear
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