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| #import "UIImageView+HGCWebImage.h"
@implementation UIImageView (HGCWebImage)
static inline UIImage *HGCWebImage_cropImage(UIImage *srcImage, CGSize size, CGFloat scale, UIRectCorner corners, CGFloat radius)
{
if (srcImage &&
CGSizeEqualToSize(size, CGSizeZero) == NO &&
corners != HGCRectCornerNone &&
(NSInteger)radius > 0)
{
UIGraphicsBeginImageContextWithOptions(size, NO, scale);
CGRect drawingRect = (CGRect){CGPointZero, size};
[[UIBezierPath bezierPathWithRoundedRect:drawingRect byRoundingCorners:(UIRectCorner)corners cornerRadii:CGSizeMake(radius, radius)] addClip];
[srcImage drawInRect:drawingRect];
UIImage *cropedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return cropedImage;
}
else {
return nil;
}
}
- (void)hgc_setImageWithURLString:(NSString *)urlstring placeholderImage:(UIImage *)placeholderImg {
[self hgc_setImageWithURLString:urlstring placeholderImage:placeholderImg loadFailImage:placeholderImg];
}
- (void)hgc_setImageWithURLString:(NSString *)urlstring
placeholderImage:(UIImage *)placeholderImg
loadFailImage:(UIImage *)loadFailImg
{
[self hgc_setImageWithURLString:urlstring placeholderImage:placeholderImg loadFailImage:loadFailImg scaleToFillSize:CGSizeZero];
}
- (void)hgc_setImageWithURLString:(NSString *)urlstring
placeholderImage:(UIImage *)placeholderImg
loadFailImage:(UIImage *)loadFailImg
scaleToFillSize:(CGSize)sizeToFill
{
[self hgc_setImageWithURLString:urlstring placeholderImage:placeholderImg loadFailImage:loadFailImg scaleToFillSize:sizeToFill roundingCorners:HGCRectCornerNone cornerRadii:0];
}
- (void)hgc_setImageWithURLString:(NSString *)urlstring
placeholderImage:(UIImage *)placeholderImg
loadFailImage:(UIImage *)loadFailImg
scaleToFillSize:(CGSize)sizeToFill
roundingCorners:(HGCRectCorner)corners
cornerRadii:(CGFloat)radius
{
if (loadFailImg == nil) {
loadFailImg = placeholderImg;
}
/**
* 首先过滤空白URL
*/
if (urlstring == nil || [urlstring hgc_isEmpty]) {
DDLogWarn(@"Image loading : url is empty");
self.image = loadFailImg;
return;
}
/**
* 生成读取缓存的key
*
* key的生成规则：
* if (size == CGSizeZero)
* key = urlstring
* else
* key = [urlstring]_[size.width]-[size.height]_[corners]
*/
NSString *keyForCachedImg;
if (CGSizeEqualToSize(sizeToFill, CGSizeZero)) {
keyForCachedImg = urlstring;
}
else {
keyForCachedImg = [urlstring stringByAppendingString:[NSString stringWithFormat:@"_%zd-%zd_%zd", (NSInteger)(sizeToFill.width), (NSInteger)(sizeToFill.height), (NSInteger)corners]];
}
/**
* 读缓存
*/
UIImage *cachedImage = [[[SDWebImageManager sharedManager] imageCache] imageFromDiskCacheForKey:keyForCachedImg];
if (cachedImage) {
self.image = cachedImage;
// 如果缓存存在，就直接返回
return;
}
self.image = placeholderImg;
/**
* 从网络下载最新的图片，然后缓存起来并更新到界面
*/
[[[SDWebImageManager sharedManager] imageDownloader] downloadImageWithURL:[NSURL URLWithString:urlstring] options:SDWebImageDownloaderAllowInvalidSSLCertificates progress:nil completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) {
if (image && error == nil && finished) {
hgc_dispatch_background_async(^{
UIImage *desImage;
if (CGSizeEqualToSize(sizeToFill, CGSizeZero)) { // 不需要拉伸和裁剪
desImage = image;
}
else {
CGFloat scale = [[UIScreen mainScreen] scale];
// 先拉伸图片
desImage = [image scaleToFillSize:CGSizeMake(sizeToFill.width * scale, sizeToFill.height * scale)];
// 再按需裁剪图片
UIImage *cropedImg = HGCWebImage_cropImage(desImage, sizeToFill, scale, (UIRectCorner)corners, radius);
if (cropedImg) {
desImage = cropedImg;
}
}
// 缓存起来，并更新到界面
if (desImage) {
[[[SDWebImageManager sharedManager] imageCache] storeImage:desImage forKey:keyForCachedImg toDisk:YES];
hgc_dispatch_main_async_safe(^{
self.image = desImage;
});
}
else {
DDLogError(@"Download Web Image: des image is nil");
hgc_dispatch_main_async_safe(^{
self.image = loadFailImg;
});
}
});
}
else {
DDLogError(@"Download Web Image: error = %@", error);
hgc_dispatch_main_async_safe(^{
self.image = loadFailImg;
});
}
}];
}
@end
|