针对有些人把setMaxConcurrentOperationCount说成是线程的多少,做下面代码测试.
{
NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{
for (int i = 0; i<5;i++)
{
NSLog(@"%@:i=%d",[NSThread currentThread] ,i);
}
}];
[op1 addExecutionBlock:^{
for (int m = 0; m<5;m++)
{
NSLog(@"%@:m=%d",[NSThread currentThread],m);
}
}];
NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{
for (int j = 0; j<5;j++)
{
NSLog(@"%@:j=%d",[NSThread currentThread] ,j);
}
}];
[op2 addExecutionBlock:^{
for (int k = 0; k<5;k++)
{
NSLog(@"%@:k=%d",[NSThread currentThread],k);
}
}];
NSBlockOperation *op3 = [NSBlockOperation blockOperationWithBlock:^{
for (int n = 0; n<5;n++)
{
NSLog(@"%@:n=%d",[NSThread currentThread] ,n);
}
}];
[op3 addExecutionBlock:^{
for (int q = 0; q<5;q++)
{
NSLog(@"%@:q=%d",[NSThread currentThread],q);
}
}];
NSOperationQueue *q = [[NSOperationQueue alloc]init];
[q setMaxConcurrentOperationCount:2];
[q addOperation:op1];
[q addOperation:op2];
[q addOperation:op3];
[q setSuspended:NO];
}
setMaxConcurrentOperationCount=1.png
setMaxConcurrentOperationCount=2.png
总结:上面分别是setMaxConcurrentOperationCount为1和2时程序输出的数据,可以看出setMaxConcurrentOperationCount表示的是并不是线程的多少,而是操作的NSBlockOperation多少.
