在执行下述方法之前，我们要先导入头文件 #import <ImageIO/ImageIO.h>
/**
* 根据图片url获取图片尺寸
*/
+ (CGSize)getImageSizeWithURL:(id)URL{
NSURL * url = nil;
if ([URL isKindOfClass:[NSURL class]]) {
url = URL;
}
if ([URL isKindOfClass:[NSString class]]) {
url = [NSURL URLWithString:URL];
}
if (!URL) {
return CGSizeZero; // url不正确返回CGSizeZero
}
CGImageSourceRef imageSourceRef = CGImageSourceCreateWithURL((CFURLRef)url, NULL);
CGFloat width = 0, height = 0;
if (imageSourceRef) {
CFDictionaryRef imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSourceRef, 0, NULL);
if (imageProperties != NULL) {
CFNumberRef widthNumberRef = CFDictionaryGetValue(imageProperties, kCGImagePropertyPixelWidth);
if (widthNumberRef != NULL) {
CFNumberGetValue(widthNumberRef, kCFNumberFloat64Type, &width);
}
CFNumberRef heightNumberRef = CFDictionaryGetValue(imageProperties, kCGImagePropertyPixelHeight);
if (heightNumberRef != NULL) {
CFNumberGetValue(heightNumberRef, kCFNumberFloat64Type, &height);
}
CFRelease(imageProperties);
}
CFRelease(imageSourceRef);
}
return CGSizeMake(width, height);
}
