多執行緒 NSThread

我們想要載入網路上的一張

#define url_imag @""

主線程直接載入：

self.imageview.image = [uiimage imagewithdata:[self loaddatawithurl:url_imag]];

//nsthread (子執行緒直接在主線程裡面載入)

// [self performselectorinbackground:@selector(loaddatawithurl:) withobject:url_imag];
//開闢乙個執行緒讓某個物件調某個方法(快速簡單)
// [nsthread detachnewthreadselector:@selector(loaddatawithurl:) totarget:self withobject:url_imag];
//用這種方式要手動開啟執行緒 (這樣寫的執行緒是可控制的)
nsthread *thread = [[nsthread alloc]initwithtarget:self selector:@selector(loaddatawithurl:) object:url_imag];
// thread.name = @"test thread";
[thread start];

#pragma mark - others

- (nsdata *)loaddatawithurl:(nsstring *)string 
- (void)updataimagviewwithdata:(nsdata *)data 

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