• 异步加载网络数据,自定义进度条显示

    转自：http://gekie.iteye.com/blog/1135627
     
     

    Objective-c代码 复制代码 收藏代码
    1. //调用方式 
    2.  
    3. Ajax *ajax = [[Ajax alloc]Ajax:urlStr  
    4.         target:self  
    5. didFinish:@selector(showData:)
    6.         isAllValues:NO  
    7.         valueForKey:@"list" 
    8.         showProgressBar:YES]; 
    9. [ajax release]; 
    10.  
    11. //异步回调方法 
    12. -(void) showData:(NSArray*)data{ 
    13.    NSLog(@"data:%@",data); 
    14. } 

    Objective-c代码 复制代码 收藏代码
    1. // 
    2. //  Ajax.h 
    3. //  live 
    4. // 
    5. //  Created by xjj xjj on 11-7-28. 
    6. //  Copyright 2011 新境界. All rights reserved. 
    7. // 
    8.  
    9. #import <Foundation/Foundation.h> 
    10. #import "UIProgressBar.h" 
    11.  
    12. @interface Ajax : NSObject { 
    13.  
    14. } 
    15. @property(nonatomic,assign) id target; 
    16. @property(nonatomic)SEL didFinish; 
    17. @property(nonatomic,retain) NSMutableData *buf; 
    18. @property(nonatomic,retain) NSURLConnection *connection; 
    19. @property(nonatomic,assign) BOOL isAllValues; 
    20. @property(nonatomic,assign) NSString* valueForKey; 
    21. @property(nonatomic,assign) BOOL isText; 
    22. @property(nonatomic,assign) NSString *urlStr; 
    23. @property(nonatomic,retain) UIProgressBar *progressBar; 
    24. @property(nonatomic,assign) long contentLength; 
    25. @property(nonatomic,assign) BOOL showProgressBar; 
    26.  
    27. -(void)start; 
    28. -(void)hiddenProgreesBar; 
    29.  
    30. /*! 
    31. @method Ajax:target:didFinish:isAllValues:valueForKey: 
    32. @discussion 异步加载某个节点数据（JSON格式） 
    33. @param _urlStr 网络数据URL 
    34. @param _target 调用者 
    35. @param _didFinish 数据加载完毕后通知动作 
    36. @param _isAllValues 是否返回所有数据 NO or YES 
    37. @param _valueForKey 加载某个节点数据 
    38. @result 初始化Ajax实例，并异步执行 
    39. */ 
    40. -(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish isAllValues:(BOOL)_isAllValues valueForKey:(NSString *)_valueForKey; 
    41.  
    42. /*! 
    43. @method Ajax:target:didFinish: 
    44. @discussion 异步加数据（文件本格式）所有文本数据 
    45. @param _urlStr 网络数据URL 
    46. @param _target 调用者 
    47. @param _didFinish 数据加载完毕后通知动作 
    48. @result 初始化Ajax实例，并异步执行 
    49. */ 
    50. -(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish; 
    51.  
    52. /*! 
    53. @method Ajax:target:didFinish:isAllValues:valueForKey:showProgressBar: 
    54. @discussion 异步加载某个节点数据（JSON格式） 
    55. @param _urlStr 网络数据URL 
    56. @param _target 调用者 
    57. @param _didFinish 数据加载完毕后通知动作 
    58. @param _isAllValues 是否返回所有数据 NO or YES 
    59. @param _valueForKey 加载某个节点数据 
    60. @param _showProgressBar 是否显示进度条 NO or YES 
    61. @result 初始化Ajax实例，并异步执行 
    62. */ 
    63. -(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish isAllValues:(BOOL)_isAllValues valueForKey:(NSString *)_valueForKey showProgressBar:(BOOL)_showProgressBar; 
    64.  
    65. /*! 
    66. @method Ajax:target:didFinish:showProgressBar 
    67. @discussion 异步加数据（文件本格式）所有文本数据 
    68. @param _urlStr 网络数据URL 
    69. @param _target 调用者 
    70. @param _didFinish 数据加载完毕后通知动作 
    71. @param _showProgressBar 是否显示进度条 NO or YES 
    72. @result 初始化Ajax实例，并异步执行 
    73. */ 
    74. -(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish showProgressBar:(BOOL)_showProgressBar; 
    75.  
    76. @end 

    实现

    Objective-c代码 复制代码 收藏代码
    1. // 
    2. //  Ajax.m 
    3. //  live 
    4. // 
    5. //  Created by xjj xjj on 11-7-28. 
    6. //  Copyright 2011 新境界. All rights reserved. 
    7. // 
    8.  
    9. #import "Ajax.h" 
    10. #import "JSONParser.h" 
    11. #import "UIProgressBar.h" 
    12.  
    13. @implementation Ajax 
    14. @synthesize target,didFinish; 
    15. @synthesize buf; 
    16. @synthesize connection; 
    17. @synthesize isAllValues,valueForKey; 
    18. @synthesize isText; 
    19. @synthesize urlStr; 
    20. @synthesize progressBar; 
    21. @synthesize contentLength; 
    22. @synthesize showProgressBar; 
    23.  
    24. -(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish showProgressBar:(BOOL)_showProgressBar{ 
    25.     if(self){ 
    26.         self.showProgressBar = _showProgressBar; 
    27.         self.urlStr = _urlStr; 
    28.         self.isText = YES; 
    29.         self.target = _target; 
    30.         self.didFinish = _didFinish; 
    31.         [self start]; 
    32.     } 
    33.     return self; 
    34. } 
    35. -(id) Ajax:(NSString*)_urlStr target:(id)_target didFinish:(SEL)_didFinish{ 
    36.     /*self = [super init]; 
    37.     if(self){ 
    38.         self.showProgressBar = YES; 
    39.         self.urlStr = _urlStr; 
    40.         self.isText = YES; 
    41.         self.target = _target; 
    42.         self.didFinish = _didFinish; 
    43.         [self start]; 
    44.     } 
    45.     return self;*/ 
    46.     return [self Ajax:_urlStr target:_target didFinish:_didFinish showProgressBar:YES]; 
    47. } 
    48.  
    49. -(id) Ajax:(NSString *)_urlStr target:(id)_target didFinish:(SEL)_didFinish isAllValues:(BOOL)_isAllValues valueForKey:(NSString *)_valueForKey showProgressBar:(BOOL)_showProgressBar{ 
    50.     self = [super init]; 
    51.     if(self){ 
    52.         self.showProgressBar = _showProgressBar; 
    53.         self.urlStr = _urlStr; 
    54.         self.isAllValues = _isAllValues; 
    55.         self.valueForKey = _valueForKey; 
    56.         self.target = _target; 
    57.         self.didFinish = _didFinish; 
    58.         [self start]; 
    59.     } 
    60.     return self; 
    61. } 
    62.  
    63. -(id) Ajax:(NSString *)_urlStr target:(id)_target didFinish:(SEL)_didFinish isAllValues:(BOOL)_isAllValues valueForKey:(NSString *)_valueForKey{ 
    64.     return [self Ajax:_urlStr target:_target didFinish:_didFinish isAllValues:_isAllValues valueForKey:_valueForKey showProgressBar:YES]; 
    65. } 
    66.  
    67. -(void)start{ 
    68.     if(connection==nil){ 
    69.         [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 
    70.         buf = [[NSMutableData alloc] initWithLength:0]; 
    71.         NSMutableURLRequest *request = [[NSMutableURLRequest alloc]init]; 
    72.         [request setURL:[NSURL URLWithString:urlStr]]; 
    73.         [request setHTTPMethod:@"GET"]; 
    74.         connection = [[NSURLConnection alloc]initWithRequest:request delegate:self]; 
    75.          
    76.         if([target isKindOfClass:[UIViewController class]]==YES&&showProgressBar==YES){ 
    77.             UIViewController *viewController = (UIViewController*)target; 
    78.             progressBar = [[UIProgressBar alloc] initWithFrame:CGRectMake(0, viewController.view.frame.size.height - 10,viewController.view.frame.size.width, 10)]; 
    79.             progressBar.minValue = 0; 
    80.              
    81.             [progressBar setLineColor:[UIColor blackColor]]; 
    82.             [progressBar setProgressColor:[UIColor redColor]];   
    83.             //[progressBar setProgressColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"3.png"]]];  
    84.             [progressBar setProgressRemainingColor:[UIColor greenColor]]; 
    85.             [viewController.view addSubview:progressBar];    
    86.         } 
    87.         [request release]; 
    88.     } 
    89. } 
    90. //收到响应时 
    91. - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{ 
    92.     if(progressBar!=nil) 
    93.         progressBar.maxValue = response.expectedContentLength; 
    94. } 
    95. //接收数据 
    96. -(void)connection:(NSURLConnection *)aConn didReceiveData:(NSData *)data{ 
    97.     [buf appendData:data]; 
    98.     if(progressBar!=nil) 
    99.         progressBar.currentValue += [data length]; 
    100. } 
    101. //加载失败 
    102. -(void)connection:(NSURLConnection*)aConn didFailWithError:(NSError*)error{ 
    103.     NSLog(@"didFailWithError:%@",error); 
    104.     [self hiddenProgreesBar]; 
    105. } 
    106. //接收完毕 
    107. -(void)connectionDidFinishLoading:(NSURLConnection *)connection{ 
    108.     if(didFinish!=nil){ 
    109.         if(isText) 
    110.             [target performSelector:didFinish withObject:buf]; 
    111.         else{ 
    112.             NSArray *data = [JSONParser parseJSON:buf isAllValues:isAllValues valueForKey:valueForKey]; 
    113.             [target performSelector:didFinish withObject:data]; 
    114.         } 
    115.     } 
    116.     [self hiddenProgreesBar]; 
    117. } 
    118. -(void) hiddenProgreesBar{ 
    119.     if(progressBar!=nil){ 
    120.     //淡淡消失效果 
    121.         [UIView animateWithDuration:2 
    122.                      animations:^{ 
    123.                          progressBar.alpha = 0; 
    124.                      }]; 
    125.         [progressBar performSelector:@selector(removeFromSuperview) withObject:nil afterDelay:2]; 
    126.     } 
    127.     [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; 
    128. } 
    129. -(void)dealloc{ 
    130.     [connection release]; 
    131.     [buf release]; 
    132.     [progressBar release]; 
    133.     [super dealloc]; 
    134. } 
    135. @end 
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  • 原文地址：https://www.cnblogs.com/jackljf/p/3589354.html
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