我应该使用哪个第三方Imageview类？
我的要求是：
我尝试过EGOImageview，AsyncImageview，FXImageview，Haneke这些我尝试过的所有课程。 我的第一部分要求已经实现。 但不是第二..如果第一次显示“xxxxx”链接图像....如果在相同的链接图像是upadated，应用程序只显示旧图像...
你可以使用下面的课程，它将完全满足你的要求
DImageView.h
#import <UIKit/UIKit.h>
@interface DImageView : UIImageView
@property (nonatomic, strong) UIActivityIndicatorView *activityView;
- (void)processImageDataWithURLString:(NSString *)urlString;
+ (UIImage *)getSavedImage :(NSString *)fileName;
+ (void)saveImageWithFolderName:(NSString *)folderName AndFileName:(NSString *)fileName AndImage:(NSData *) imageData;
DImageView.m
#import "DImageView.h"
#define IMAGES_FOLDER_NAME @"DImages"
@implementation DImageView
#pragma mark - App Life Cycle
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
}
return self;
}
- (void)dealloc
{
self.activityView = nil;
[super dealloc];
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self)
{
[self initWithFrame:[self frame]];
}
return self;
}
#pragma mark - Download images
- (void)processImageDataWithURLString:(NSString *)urlString //andBlock:(void (^)(UIImage * img))processImage
{
@autoreleasepool
{
UIImage * saveImg = [DImageView getSavedImage:urlString];
if (saveImg)
{
dispatch_queue_t callerQueue = dispatch_get_main_queue();
dispatch_async(callerQueue, ^{
@autoreleasepool
{
[self setImage:saveImg];
}
});
}
else
{
[self showActivityIndicator];
NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
dispatch_queue_t callerQueue = dispatch_get_main_queue();
dispatch_queue_t downloadQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH,0);
__block NSError* error = nil;
dispatch_async(downloadQueue, ^{
NSData * imageData = [[[NSData dataWithContentsOfURL:url options:NSDataReadingUncached error:&error] retain] autorelease];
if (error)
{
NSLog(@"DImg Error %@", [error debugDescription]);
}
else
{
dispatch_async(callerQueue, ^{
@autoreleasepool
{
UIImage *image = [UIImage imageWithData:imageData];
[self setImage:image];
[self hideActivityIndicator];
/* Below code is to save image*/
[DImageView saveImageWithFolderName:IMAGES_FOLDER_NAME AndFileName:urlString AndImage:imageData];
}
});
}
});
dispatch_release(downloadQueue);
}
}
}
#pragma mark - File Save methods
+ (void)saveImageWithFolderName:(NSString *)folderName AndFileName:(NSString *)fileName AndImage:(NSData *) imageData
{
@autoreleasepool
{
NSFileManager *fileManger = [NSFileManager defaultManager] ;
NSString *directoryPath = [NSString stringWithFormat:@"%@/%@",[DImageView applicationDocumentsDirectory],folderName] ;
if (![fileManger fileExistsAtPath:directoryPath])
{
NSError *error = nil;
[fileManger createDirectoryAtPath:directoryPath withIntermediateDirectories:YES attributes:nil error:&error];
}
fileName = [DImageView fileNameValidate:fileName];
NSString *filePath = [NSString stringWithFormat:@"%@/%@",directoryPath,fileName] ;
BOOL isSaved = [imageData writeToFile:filePath atomically:YES];
if (!isSaved)
{
NSLog(@" ** Img Not Saved");
}
}
}
+ (NSString *)applicationDocumentsDirectory
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
return basePath;
}
+ (UIImage *)getSavedImage :(NSString *)fileName
{
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
fileName = [DImageView fileNameValidate:fileName];
NSFileManager * fileManger = [NSFileManager defaultManager] ;
NSString * directoryPath = [NSString stringWithFormat:@"%@/%@",[DImageView applicationDocumentsDirectory],IMAGES_FOLDER_NAME] ;
NSString * filePath = [NSString stringWithFormat:@"%@/%@",directoryPath,fileName] ;
if ([fileManger fileExistsAtPath:directoryPath])
{
UIImage *image = [UIImage imageWithContentsOfFile:filePath] ;
if (image)
{
return image;
}
else
{
NSLog(@"** Img Not Found **");
return nil;
}
}
[pool release];
return nil;
}
+ (NSString*) fileNameValidate : (NSString*) name
{
name = [name stringByReplacingOccurrencesOfString:@"://" withString:@"##"];
name = [name stringByReplacingOccurrencesOfString:@"/" withString:@"#"];
name = [name stringByReplacingOccurrencesOfString:@"%20" withString:@""];
return name;
}
#pragma mark - Activity Methods
- (void) showActivityIndicator
{
self.activityView = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
self.activityView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin;
self.activityView.hidesWhenStopped = TRUE;
self.activityView.backgroundColor = [UIColor clearColor];
self.activityView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
[self addSubview:self.activityView];
[self.activityView startAnimating];
}
- (void) hideActivityIndicator
{
CAAnimation *animation = [NSClassFromString(@"CATransition") animation];
[animation setValue:@"kCATransitionFade" forKey:@"type"];
animation.duration = 0.4;;
[self.layer addAnimation:animation forKey:nil];
[self.activityView stopAnimating];
[self.activityView removeFromSuperview];
for (UIView * view in self.subviews)
{
if([view isKindOfClass:[UIActivityIndicatorView class]])
[view removeFromSuperview];
}
}
这堂课会做什么？ 它将从服务器下载图像并将其保存到应用程序文档目录并从本地获取（如果可用）。
如何使用它？ 为UIImageView设置DImageView类在您的nib文件中。
然后你可以简单地在你的.m文件中使用它。
[imgViewName processImageDataWithURLString:imageURl];
你应该看看SDWebImage。 它是目前使用最多的UIImageView类别之一，提供了很多功能，包括缓存。
查看文档的这一部分，了解如何使用它刷新缓存：处理图像刷新
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