ios多執行緒之NSThread總結

因為不常用，所以nsthread需要掌握的沒有多少，會這些就夠了：

1.建立方式：

-------
(1)建立後啟動
nsthread *thread=[[nsthread alloc] initwithtarget:self selector:@selector(download:) object:@"先建立,後啟動"];
[thread start];
(2)建立後立即啟動
[nsthread detachnewthreadselector:@selector(download:) totarget:self withobject:@"建立自動啟動"];
(3)隱式啟動
[self performselectorinbackground:@selector(download:) withobject:@"隱式建立"];
2.常用方法：
-------
(1)獲得主線程：
[nsthread mainthread];
(2)獲得當前執行緒：
[nsthread currentthread];
(3)設定執行緒名字(除錯用)：
[[nsthread currentthread] setname:@"thread1"];
(4)nsthread互斥鎖 保證原子 盡量不用：
@synchronized(self) 
[self performselectoronmainthread:@selector(setimageafterdownload:) withobject:image waituntildone:yes];
或者要設定imageview的時候可以這樣:[self
.imageview performselectoronmainthread:@selector(setimage:) withobject:image waituntildone:yes];

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