ios - 如何在 NSArray 中获取图像 url 的 CGSizes

Question

我有一个 NSArray，其中包含 NSString 图片 url，如下所示:

NSArray *array = [NSArray arrayWithObjects:@"http://graphics8.nytimes.com/images/2014/07/22/blogs/20140722-lens-mark-slide-SG5C/20140722-lens-mark-slide-SG5C-custom1.jpg", @"http://graphics8.nytimes.com/images/2014/07/22/blogs/20140722-lens-mark-slide-SG5C/20140722-lens-mark-slide-SG5C-custom2.jpg", @"http://graphics8.nytimes.com/images/2014/07/22/blogs/20140722-lens-mark-slide-6N62/20140722-lens-mark-slide-6N62-blog480.jpg", nil];

如何获取每个 imageUrl 的 CGSize？

我知道如何像这样获取一个 imageUrl 的大小:

UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://graphics8.nytimes.com/images/2014/07/22/blogs/20140722-lens-mark-slide-SG5C/20140722-lens-mark-slide-SG5C-jumbo.jpg"]]];
CGSize imageSize = image.size;

Answer 1

for(NSString *stringURL in array)
{
    UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:stringURL]]];
    CGSize imageSize = image.size;
}

我不建议在主线程中这样做。

如果你想获得大小数组，你应该执行以下操作:

NSMutableArray *sizes = [NSMutableArray array];
for(NSString *stringURL in array)
{
    UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:stringURL]]];
    CGSize imageSize = image.size;
    [sizes addObject:[NSValue valueWithCGSize:imageSize];
}

之后可以通过以下方式获取CGSize:

CGSize imageSize = [sizes[index] CGSizeValue];