异步加载网络数据,自定义进度条显示

转自：/article/3983303.html



Objective-c代码







//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);
}

Objective-c代码







//
// 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

Objective-c代码







//
// 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