异步加载网络数据,自定义进度条显示

原文地址：http://gekie.iteye.com/blog/1135627

 

 

 

 

//调用方式

Ajax *ajax = [[Ajax alloc]Ajax:urlStr
        target:self
        didFinish:@selector(showData:)
        isAllValues:NO
        valueForKey:@"list"
        showProgressBar:YES];
[ajax release];

//异步回调方法
-(void) showData:(NSArray*)data{
   NSLog(@"data:%@",data);
}

//调用方式

Ajax *ajax = [[Ajax alloc]Ajax:urlStr 
		target:self 
		didFinish:@selector(showData:) 
		isAllValues:NO 
		valueForKey:@"list"
		showProgressBar:YES];
[ajax release];

//异步回调方法
-(void) showData:(NSArray*)data{
   NSLog(@"data:%@",data);
}

 

//
//  Ajax.h
//  live
//
//  Created by xjj xjj on 11-7-28.
//  Copyright 2011 新境界. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "UIProgressBar.h"

@interface Ajax : NSObject {

}
@property(nonatomic,assign) id target;
@property(nonatomic)SEL didFinish;
@property(nonatomic,retain) NSMutableData *buf;
@property(nonatomic,retain) NSURLConnection *connection;
@property(nonatomic,assign) BOOL isAllValues;
@property(nonatomic,assign) NSString* valueForKey;
@property(nonatomic,assign) BOOL isText;
@property(nonatomic,assign) NSString *urlStr;
@property(nonatomic,retain) UIProgressBar *progressBar;
@property(nonatomic,assign) long contentLength;
@property(nonatomic,assign) BOOL showProgressBar;

-(void)start;
-(void)hiddenProgreesBar;

/*!
@method Ajax:target:didFinish:isAllValues:valueForKey:
@discussion 异步加载某个节点数据（JSON格式）
@param _urlStr 网络数据URL
@param _target 调用者
@param _didFinish 数据加载完毕后通知动作
@param _isAllValues 是否返回所有数据 NO or YES
@param _valueForKey 加载某个节点数据
@result 初始化Ajax实例，并异步执行
*/
-(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish isAllValues:(BOOL)_isAllValues valueForKey:(NSString *)_valueForKey;

/*!
@method Ajax:target:didFinish:
@discussion 异步加数据（文件本格式）所有文本数据
@param _urlStr 网络数据URL
@param _target 调用者
@param _didFinish 数据加载完毕后通知动作
@result 初始化Ajax实例，并异步执行
*/
-(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish;

/*!
@method Ajax:target:didFinish:isAllValues:valueForKey:showProgressBar:
@discussion 异步加载某个节点数据（JSON格式）
@param _urlStr 网络数据URL
@param _target 调用者
@param _didFinish 数据加载完毕后通知动作
@param _isAllValues 是否返回所有数据 NO or YES
@param _valueForKey 加载某个节点数据
@param _showProgressBar 是否显示进度条 NO or YES
@result 初始化Ajax实例，并异步执行
*/
-(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish isAllValues:(BOOL)_isAllValues valueForKey:(NSString *)_valueForKey showProgressBar:(BOOL)_showProgressBar;

/*!
@method Ajax:target:didFinish:showProgressBar
@discussion 异步加数据（文件本格式）所有文本数据
@param _urlStr 网络数据URL
@param _target 调用者
@param _didFinish 数据加载完毕后通知动作
@param _showProgressBar 是否显示进度条 NO or YES
@result 初始化Ajax实例，并异步执行
*/
-(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish showProgressBar:(BOOL)_showProgressBar;

@end

//
//  Ajax.h
//  live
//
//  Created by xjj xjj on 11-7-28.
//  Copyright 2011 新境界. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "UIProgressBar.h"

@interface Ajax : NSObject {

}
@property(nonatomic,assign) id target;
@property(nonatomic)SEL didFinish;
@property(nonatomic,retain) NSMutableData *buf;
@property(nonatomic,retain) NSURLConnection *connection;
@property(nonatomic,assign) BOOL isAllValues;
@property(nonatomic,assign) NSString* valueForKey;
@property(nonatomic,assign) BOOL isText;
@property(nonatomic,assign) NSString *urlStr;
@property(nonatomic,retain) UIProgressBar *progressBar;
@property(nonatomic,assign) long contentLength;
@property(nonatomic,assign) BOOL showProgressBar;

-(void)start;
-(void)hiddenProgreesBar;

/*!
@method Ajax:target:didFinish:isAllValues:valueForKey:
@discussion 异步加载某个节点数据（JSON格式）
@param _urlStr 网络数据URL
@param _target 调用者
@param _didFinish 数据加载完毕后通知动作
@param _isAllValues 是否返回所有数据 NO or YES
@param _valueForKey 加载某个节点数据
@result 初始化Ajax实例，并异步执行
*/
-(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish isAllValues:(BOOL)_isAllValues valueForKey:(NSString *)_valueForKey;

/*!
@method Ajax:target:didFinish:
@discussion 异步加数据（文件本格式）所有文本数据
@param _urlStr 网络数据URL
@param _target 调用者
@param _didFinish 数据加载完毕后通知动作
@result 初始化Ajax实例，并异步执行
*/
-(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish;

/*!
@method Ajax:target:didFinish:isAllValues:valueForKey:showProgressBar:
@discussion 异步加载某个节点数据（JSON格式）
@param _urlStr 网络数据URL
@param _target 调用者
@param _didFinish 数据加载完毕后通知动作
@param _isAllValues 是否返回所有数据 NO or YES
@param _valueForKey 加载某个节点数据
@param _showProgressBar 是否显示进度条 NO or YES
@result 初始化Ajax实例，并异步执行
*/
-(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish isAllValues:(BOOL)_isAllValues valueForKey:(NSString *)_valueForKey showProgressBar:(BOOL)_showProgressBar;

/*!
@method Ajax:target:didFinish:showProgressBar
@discussion 异步加数据（文件本格式）所有文本数据
@param _urlStr 网络数据URL
@param _target 调用者
@param _didFinish 数据加载完毕后通知动作
@param _showProgressBar 是否显示进度条 NO or YES
@result 初始化Ajax实例，并异步执行
*/
-(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish showProgressBar:(BOOL)_showProgressBar;

@end

 

实现

 

//
//  Ajax.m
//  live
//
//  Created by xjj xjj on 11-7-28.
//  Copyright 2011 新境界. All rights reserved.
//

#import "Ajax.h"
#import "JSONParser.h"
#import "UIProgressBar.h"

@implementation Ajax
@synthesize target,didFinish;
@synthesize buf;
@synthesize connection;
@synthesize isAllValues,valueForKey;
@synthesize isText;
@synthesize urlStr;
@synthesize progressBar;
@synthesize contentLength;
@synthesize showProgressBar;

-(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish showProgressBar:(BOOL)_showProgressBar{
    if(self){
        self.showProgressBar = _showProgressBar;
        self.urlStr = _urlStr;
        self.isText = YES;
        self.target = _target;
        self.didFinish = _didFinish;
        [self start];
    }
    return self;
}
-(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish{
    /*self = [super init];
    if(self){
        self.showProgressBar = YES;
        self.urlStr = _urlStr;
        self.isText = YES;
        self.target = _target;
        self.didFinish = _didFinish;
        [self start];
    }
    return self;*/
    return [self Ajax:_urlStr target:_target didFinish:_didFinish showProgressBar:YES];
}

-(id) Ajax:(NSString *)_urlStr target:(id)_target didFinish:(SEL)_didFinish isAllValues:(BOOL)_isAllValues valueForKey:(NSString *)_valueForKey showProgressBar:(BOOL)_showProgressBar{
    self = [super init];
    if(self){
        self.showProgressBar = _showProgressBar;
        self.urlStr = _urlStr;
        self.isAllValues = _isAllValues;
        self.valueForKey = _valueForKey;
        self.target = _target;
        self.didFinish = _didFinish;
        [self start];
    }
    return self;
}

-(id) Ajax:(NSString *)_urlStr target:(id)_target didFinish:(SEL)_didFinish isAllValues:(BOOL)_isAllValues valueForKey:(NSString *)_valueForKey{
    return [self Ajax:_urlStr target:_target didFinish:_didFinish isAllValues:_isAllValues valueForKey:_valueForKey showProgressBar:YES];
}

-(void)start{
    if(connection==nil){
        [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
        buf = [[NSMutableData alloc] initWithLength:0];
        NSMutableURLRequest *request = [[NSMutableURLRequest alloc]init];
        [request setURL:[NSURL URLWithString:urlStr]];
        [request setHTTPMethod:@"GET"];
        connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];

        if([target isKindOfClass:[UIViewController class]]==YES&&showProgressBar==YES){
            UIViewController *viewController = (UIViewController*)target;
            progressBar = [[UIProgressBar alloc] initWithFrame:CGRectMake(0, viewController.view.frame.size.height - 10,viewController.view.frame.size.width, 10)];
            progressBar.minValue = 0;

            [progressBar setLineColor:[UIColor blackColor]];
            [progressBar setProgressColor:[UIColor redColor]];
            //[progressBar setProgressColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"3.png"]]];
            [progressBar setProgressRemainingColor:[UIColor greenColor]];
            [viewController.view addSubview:progressBar];
        }
        [request release];
    }
}
//收到响应时
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    if(progressBar!=nil)
        progressBar.maxValue = response.expectedContentLength;
}
//接收数据
-(void)connection:(NSURLConnection *)aConn didReceiveData:(NSData *)data{
    [buf appendData:data];
    if(progressBar!=nil)
        progressBar.currentValue += [data length];
}
//加载失败
-(void)connection:(NSURLConnection*)aConn didFailWithError:(NSError*)error{
    NSLog(@"didFailWithError:%@",error);
    [self hiddenProgreesBar];
}
//接收完毕
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
    if(didFinish!=nil){
        if(isText)
            [target performSelector:didFinish withObject:buf];
        else{
            NSArray *data = [JSONParser parseJSON:buf isAllValues:isAllValues valueForKey:valueForKey];
            [target performSelector:didFinish withObject:data];
        }
    }
    [self hiddenProgreesBar];
}
-(void) hiddenProgreesBar{
    if(progressBar!=nil){
    //淡淡消失效果
        [UIView animateWithDuration:2
                     animations:^{
                         progressBar.alpha = 0;
                     }];
        [progressBar performSelector:@selector(removeFromSuperview) withObject:nil afterDelay:2];
    }
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
-(void)dealloc{
    [connection release];
    [buf release];
    [progressBar release];
    [super dealloc];
}
@end