IOS/swift 异步缓存文件

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#import "DownLoadMp3.h"

#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0)

static DownLoadMp3 *sharedObj =nil;

NSMutableArray *arrList;

@implementation DownLoadMp3

+ (DownLoadMp3 *) sharedInstance

{

staticdispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

arrList=[[NSMutableArrayalloc] init];

sharedObj=[[DownLoadMp3alloc] init];

});

returnsharedObj;

}

+ (id) allocWithZone:(NSZone *)zone//第三步：重写allocWithZone方法

{

staticdispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

sharedObj=[superallocWithZone:zone];

});

returnsharedObj;

}

- (id) copyWithZone:(NSZone *)zone//第四步

{

returnself;

}

-(void)downLoadUrl:(NSString *)fileUrl{

if (fileUrl==nil||[fileUrllength]==0) {

return;

}

if (!([fileUrlhasPrefix:@"http://"]||[fileUrlhasPrefix:@"https://"])) {

return;

}

if (![arrListcontainsObject:fileUrl]) {

[arrListaddObject:fileUrl];

}

[NSThreaddetachNewThreadSelector:@selector(downloadMp3)toTarget:selfwithObject:nil];

}

-(void)downloadMp3{

NSString *urlString = [selfgetMp3Url];

while (urlString!=nil && [urlStringlength]>0) {

@try{

dispatch_async(kBgQueue, ^{

NSData *data = [NSDatadataWithContentsOfURL:[NSURLURLWithString:urlString]];

if ([datalength]==0) {

NSLog(@"%@ ++++++++++++++++++++++++++++++++++++++",urlString);

}else{

NSLog(@"%@ ++++++++++++++++++++++++++++++++++++++ %lu",urlString, [datalength]);

}

});

[NSThreadsleepForTimeInterval:0.1];

}@catch (NSException * e) {

break;

}

urlString = [selfgetMp3Url];

}

-(NSString *)getMp3Url{

NSMutableString *str=[[NSMutableStringalloc] init];

@synchronized(arrList){

if([arrListcount]==0)returnnil;

while(arrList.count>5)[arrListremoveObjectAtIndex:0];

[str setString:arrList[0]] ;

[arrListremoveObjectAtIndex:0];

return str;

}

@end

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