#import "ImageCaChe.h"
@interface ImageCaChe ()
@property(nonatomic,strong)NSCache *memoryCache;
@end
@implementation ImageCaChe
+(instancetype)sharedCaChe{
static ImageCaChe *sharedInstanceCache = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstanceCache = [[self alloc]init];
});
return sharedInstanceCache;
}
-(void)loadImageWithURL:(NSURL *)url completion:(void (^)(UIImage * _Nonnull))completion{
UIImage *cacheImage = [self getCacheImageWithURL:url];
if(cacheImage){
completion(cacheImage);
return;
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData *imageData = [NSData dataWithContentsOfURL:url];
UIImage *image = [UIImage imageWithData:imageData];
if(image){
[self cacheImage:image withURL:url];
}
dispatch_async(dispatch_get_main_queue(), ^{
completion(image);
});
});
}
-(UIImage*)getCacheImageWithURL:(NSURL*)url{
NSString *key = url.absoluteString;
return [[self memoryCache]objectForKey:key];
}
-(void)cacheImage:(UIImage*)image withURL:(NSURL*)url{
NSString *key = url.absoluteString;
[[self memoryCache]setObject:image forKey:url];
}
-(NSCache *)memoryCache{
static NSCache *cache = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
cache = [[NSCache alloc]init];
cache.totalCostLimit = 50;
});
return cache;
}
@end