多线程下文件的代码
.h

1. NSString*FDownLoadDefaultFile;   //下载异常状态的默认文件
   
2. NSString*FDownLoadLocalFilePath; //下载到本地的保存路径
   
3. NSIntegerFDownLoadFileCount;     //当前下载的文件总数
   
4. NSInteger FDownLoadID;            //下载序列ID
   
5. NSMutableArray*FDownLoadFileArr;        //下载到本地的文件
   
6. NSMutableArray*FDownLoadNetworkFilePathArr;    //需要下载到本地的网络文件路径
   
7. NSCondition*FDownloadLockCondition;  //线程锁
   
8. 
   
9. //下载文件
   
10. //多线程下载文件
    
11. -(void)DownloadFileByThread : (NSArray *)AFileArr                 //需要下载的文件集合数组
    
12.     ADownloadDirPath : (NSString *)ADownloadFilePath       //需要下载到本地的目录路径，结尾为“/”
    
13. ADownloadDefaultFileURL : (NSString *)ADownloadDeaultFileURL; //如果需要下载的文件不存在，则需要下载的默认文件
    
14. //下载主线程
    
15. -(void)DownloadMainThread : (NSArray *)ADataArr;      //传递到线程中的数据集合，
    
16.       //位置0＝本地下载目录
    
17. //位置1＝下载文件地址
    
18.       //位置2＝默认下载文件
    
19. //位置3＝文件所属的位置索引号

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.m

1. -(void)SetDownloadFileID : (NSInteger)AID {
   
2. FDownLoadID= AID;
   
3. }
   
4. 
   
5. -(void)DownloadFileByThread : (NSArray *)AFileArr
   
6.     ADownloadDirPath : (NSString *)ADownloadFilePath
   
7. ADownloadDefaultFileURL : (NSString *)ADownloadDeaultFileURL {
   
8. NSInteger AFileCount = [AFileArr count];
   
9. NSString *ALocalFile = ADownloadFilePath;
   
10. NSString *AFileName;
    
11. NSString *AFileURL;
    
12. NSString *ADefaultFile;
    
13. NSMutableArray*ADataArr;
    
14. 
    
15. [[NSURLCachesharedURLCache] removeAllCachedResponses];
    
16. FDownLoadNetworkFilePathArr= [[NSMutableArrayalloc] initWithArray:AFileArr];
    
17. FDownLoadFileArr = [[NSMutableArray alloc] initWithCapacity:AFileCount];
    
18. FDownLoadFileCount= 0;
    
19. FDownloadLockCondition= [[NSConditionalloc] init];
    
20. 
    
21. for (int i = 0; i < AFileCount; i++) {
    
22. [FDownLoadFileArraddObject:@""];
    
23. }
    
24. 
    
25. for (int i = 0; i < AFileCount; i++) {
    
26. AFileURL = [[NSString alloc] initWithString: [AFileArr objectAtIndex : i]];
    
27. AFileName = [ALocalFile stringByAppendingString:[self GetFileName:AFileURL]];
    
28. 
    
29. ADataArr = [[NSMutableArray alloc] initWithCapacity:3];
    
30. [ADataArr addObject:ALocalFile];
    
31. if([[NSFileManagerdefaultManager] fileExistsAtPath:AFileName] == NO) {
    
32. //NSLog(@"%@",AFileURL);
    
33. [ADataArr addObject:AFileURL];
    
34. [ADataArr addObject:ADownloadDeaultFileURL];
    
35. [ADataArr addObject:[[NSStringalloc] initWithFormat:@"%d",i]];
    
36. 
    
37. [NSThreaddetachNewThreadSelector:@selector(DownloadMainThread:) toTarget:selfwithObject:ADataArr];
    
38. [ADataArr release];
    
39. }
    
40. else {
    
41. //NSLog(@"%@",AFileName);
    
42. if (AFileURL == @"") {
    
43. ADefaultFile = [ALocalFile stringByAppendingString:[self GetFileName:ADownloadDeaultFileURL]];
    
44. if ([[NSFileManager defaultManager] fileExistsAtPath:ADefaultFile] == NO) {
    
45. [ADataArr addObject:ADownloadDeaultFileURL];
    
46. [ADataArr addObject:ADownloadDeaultFileURL];
    
47. [ADataArr addObject:[[NSStringalloc] initWithFormat:@"%d",i]];
    
48. [NSThreaddetachNewThreadSelector:@selector(DownloadMainThread:) toTarget:selfwithObject:ADataArr];
    
49. [ADataArr release];
    
50. }
    
51. else {
    
52. FDownLoadFileCount++;
    
53. [FDownLoadFileArrreplaceObjectAtIndex:i withObject:ADefaultFile];
    
54. //[FDownLoadFileArr addObject:ADefaultFile];
    
55. }
    
56. }
    
57. else {
    
58. FDownLoadFileCount++;
    
59. [FDownLoadFileArrreplaceObjectAtIndex:i withObject:AFileName];
    
60. //[FDownLoadFileArr setValue:AFileName forKey:[[NSString alloc] initWithFormat:@"%d",i]];
    
61. //[FDownLoadFileArr addObject:AFileName];
    
62. }
    
63. 
    
64. }
    
65. 
    
66. }
    
67. if(FDownLoadFileCount== [FDownLoadNetworkFilePathArrcount]) {   //完成全部下载
    
68. [self.delegate DownLoadFileDidFinish:FDownLoadFileArr AID : FDownLoadID];
    
69. [FDownLoadNetworkFilePathArrrelease];
    
70. [FDownLoadFileArrrelease];
    
71. [FDownloadLockConditionrelease];
    
72. 
    
73. }
    
74. }
    
75. 
    
76. -(void)DownloadMainThread : (NSArray *)ADataArr {
    
77. NSString *ALocalFile = [ADataArr objectAtIndex:0];
    
78. //NSLog(@"%@",[ADataArr objectAtIndex:1]);
    
79. NSURL*AURL = [[NSURLalloc] initWithString:[ADataArr objectAtIndex:1]];
    
80. NSData *AFileData = [[NSData alloc] initWithContentsOfURL:AURL];
    
81. if (AFileData != nil) {
    
82. ALocalFile = [ALocalFile stringByAppendingString:[self GetFileName:[ADataArr objectAtIndex:1]]];
    
83. //NSLog(@"%@",ALocalFile);
    
84. [AFileData writeToFile:ALocalFile atomically:YES];
    
85. }
    
86. else{    //不存在指定路径的文件，使用默认文件
    
87. NSString *ADefaultFile = [ALocalFile stringByAppendingString:[self GetFileName:[ADataArr objectAtIndex:2]]];
    
88. if ([[NSFileManager defaultManager] fileExistsAtPath:ADefaultFile] == NO) {
    
89. [AURL release];
    
90. [AFileData release];
    
91. AURL = [[NSURLalloc] initWithString:[ADataArr objectAtIndex:2]];
    
92. AFileData = [[NSData alloc] initWithContentsOfURL:AURL];
    
93. if (AFileData != nil) {
    
94. ALocalFile = [ALocalFile stringByAppendingString:[self GetFileName:[ADataArr objectAtIndex:1]]];
    
95. [AFileData writeToFile:ALocalFile atomically:YES];
    
96. }
    
97. else {
    
98. ALocalFile = [DocumentPathstringByAppendingString:@"default.png"];
    
99. }
    
100. }
     
101. }
     
102. //NSLog(@"ADataArr = %@",[ADataArr objectAtIndex:3]);
     
103. [FDownloadLockConditionlock];    //上锁
     
104. FDownLoadFileCount++;
     
105. [FDownLoadFileArrreplaceObjectAtIndex:[[ADataArr objectAtIndex:3] intValue] withObject:ALocalFile];
     
106. [FDownloadLockConditionunlock];  //解锁
     
107. 
     
108. [AURL release];
     
109. [ALocalFile release];
     
110. [AFileData release];
     
111. 
     
112. if(FDownLoadFileCount== [FDownLoadNetworkFilePathArrcount]) {   //完成全部下载
     
113. [self.delegate DownLoadFileDidFinish:FDownLoadFileArr AID : FDownLoadID];
     
114. [FDownLoadNetworkFilePathArrrelease];
     
115. [FDownLoadFileArrrelease];
     
116. [FDownloadLockConditionrelease];
     
117. }
     
118. }

复制代码

这个得支持一下

还有设备 看再多也是没什么用的

  支持一下

学习一下，有空代码贴进去试验一下