学步园

#import <UIKit/UIKit.h><br /> #import "ASIHTTPRequestDelegate.h"<br /> @interface UIAsyncImageView : UIView<ASIHTTPRequestDelegate><br /> {<br /> UIImageView *m_pImageView;<br /> UIActivityIndicatorView *m_pIndicator;<br /> bool m_bIsLoaded;<br /> }<br /> @property (nonatomic, retain) UIImageView *m_pImageView;<br /> @property (nonatomic, retain) UIActivityIndicatorView *m_pIndicator;<br /> @property (nonatomic) bool m_bIsLoaded;<br /> - (void) LoadImage:(NSString *) strURL;<br /> @end 

#import "UIAsyncImageView.h"<br /> #import "ProductService.h"<br /> @implementation UIAsyncImageView<br /> @synthesize m_pImageView;<br /> @synthesize m_pIndicator;<br /> @synthesize m_bIsLoaded;<br /> - (void) LoadImage:(NSString *) strURL<br /> {<br /> if (!m_bIsLoaded)<br /> {<br /> [使用ASIHttpRequest的异步下载];<br /> [m_pIndicator startAnimating];<br /> }<br /> }<br /> - (id)initWithFrame:(CGRect)frame {<br /> self = [super initWithFrame:frame];<br /> if (self) {<br /> // Initialization code.<br /> m_pImageView = [[UIImageView alloc] init];<br /> [self addSubview:m_pImageView];</p> <p> m_pIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(50, 50, 20, 20)];<br /> [m_pIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];<br /> [self addSubview:m_pIndicator];</p> <p> m_bIsLoaded = NO;<br /> }<br /> return self;<br /> }<br /> /*<br /> // Only override drawRect: if you perform custom drawing.<br /> // An empty implementation adversely affects performance during animation.<br /> - (void)drawRect:(CGRect)rect {<br /> // Drawing code.<br /> }<br /> */<br /> - (void)dealloc {<br /> [m_pImageView release];<br /> [m_pIndicator release];<br /> [super dealloc];<br /> }<br /> #pragma mark -<br /> #pragma mark ASI HTTP Request Methods<br /> - (void)requestFinished:(ASIHTTPRequest *)request<br /> {<br /> NSLog(@"UIAsyncImageView: the web image has been loaded completely/n");</p> <p> [m_pIndicator stopAnimating];<br /> m_bIsLoaded = YES;</p> <p> UIImage *image = [UIImage imageWithData:[request responseData]];<br /> [m_pImageView setImage:image];</p> <p> m_pImageView.contentMode = UIViewContentModeScaleAspectFit;<br /> m_pImageView.autoresizingMask = (UIViewAutoresizingFlexibleWidth || UIViewAutoresizingFlexibleHeight);</p> <p> m_pImageView.frame = self.bounds;<br /> [m_pImageView setNeedsLayout];<br /> [self setNeedsLayout];<br /> }<br /> @end