jianbinglian/Jianbinglian/Category(分类扩展)/UIImageView+MT.m

//
//  UIImageView+MT.m
//  Demo
//
//  Created by Simon on 2019/8/17.
//  Copyright © 2019 Simon. All rights reserved.
//

#import "UIImageView+MT.h"

@implementation UIImageView (MT)
- (void)showInMiddle
{
    [self setContentScaleFactor:[[UIScreen mainScreen] scale]];
    self.contentMode =  UIViewContentModeScaleAspectFill;
    self.autoresizingMask = UIViewAutoresizingFlexibleHeight;
    self.clipsToBounds  = YES;
    self.layer.masksToBounds = YES;
}
#pragma mark -- 获取网络图片大小
/**
 *  根据图片url获取网络图片尺寸
 */
-(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;
    }
    CGImageSourceRef imageSourceRef = CGImageSourceCreateWithURL((CFURLRef)url, NULL);
    CGFloat width = 0, height = 0;
    
    if (imageSourceRef) {
        
        // 获取图像属性
        CFDictionaryRef imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSourceRef, 0, NULL);
        
        //以下是对手机32位、64位的处理
        if (imageProperties != NULL) {
            
            CFNumberRef widthNumberRef = CFDictionaryGetValue(imageProperties, kCGImagePropertyPixelWidth);
            
#if defined(__LP64__) && __LP64__
            if (widthNumberRef != NULL) {
                CFNumberGetValue(widthNumberRef, kCFNumberFloat64Type, &width);
            }
            
            CFNumberRef heightNumberRef = CFDictionaryGetValue(imageProperties, kCGImagePropertyPixelHeight);
            
            if (heightNumberRef != NULL) {
                CFNumberGetValue(heightNumberRef, kCFNumberFloat64Type, &height);
            }
#else
            if (widthNumberRef != NULL) {
                CFNumberGetValue(widthNumberRef, kCFNumberFloat32Type, &width);
            }
            
            CFNumberRef heightNumberRef = CFDictionaryGetValue(imageProperties, kCGImagePropertyPixelHeight);
            
            if (heightNumberRef != NULL) {
                CFNumberGetValue(heightNumberRef, kCFNumberFloat32Type, &height);
            }
#endif
            /***************** 此处解决返回图片宽高相反问题 *****************/
            // 图像旋转的方向属性
            NSInteger orientation = [(__bridge NSNumber *)CFDictionaryGetValue(imageProperties, kCGImagePropertyOrientation) integerValue];
            CGFloat temp = 0;
            switch (orientation) {  // 如果图像的方向不是正的，则宽高互换
                case UIImageOrientationLeft: // 向左逆时针旋转90度
                case UIImageOrientationRight: // 向右顺时针旋转90度
                case UIImageOrientationLeftMirrored: // 在水平翻转之后向左逆时针旋转90度
                case UIImageOrientationRightMirrored: { // 在水平翻转之后向右顺时针旋转90度
                    temp = width;
                    width = height;
                    height = temp;
                }
                    break;
                default:
                    break;
            }
            /***************** 此处解决返回图片宽高相反问题 *****************/
            
            CFRelease(imageProperties);
        }
        CFRelease(imageSourceRef);
    }
    return CGSizeMake(width, height);
}
@end