IOS开发（66）之构建自己的分派队列
1 前言
使用 dispatch_queue_create 函数。 创建你自己的、独特命名的分派队列。
2 代码实例
zyappdelegate.m
[plain]
- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions
{
//创建自己命名的队列
dispatch_queue_t firstserialqueue = dispatch_queue_create("zyappdelegate.gcd.serialqueue1", 0);
//执行block
dispatch_async(firstserialqueue, ^{
nsuinteger counter = 0;
for (counter = 0;counter < 5;counter++){
nslog(@"first iteration, counter = %lu", (unsigned long)counter);
} });
dispatch_async(firstserialqueue, ^{
nsuinteger counter = 0;
for (counter = 0;
counter < 5;
counter++){
nslog(@"second iteration, counter = %lu", (unsigned long)counter);
} });
dispatch_async(firstserialqueue, ^{
nsuinteger counter = 0;
for (counter = 0;
counter < 5;
counter++){
nslog(@"third iteration, counter = %lu", (unsigned long)counter);
} });
//释放队列
dispatch_release(firstserialqueue);
self.window = [[[uiwindow alloc] initwithframe:[[uiscreen mainscreen] bounds]] autorelease];
// override point for customization after application launch.
self.viewcontroller = [[[zyviewcontroller alloc] initwithnibname:@"zyviewcontroller" bundle:nil] autorelease];
self.window.rootviewcontroller = self.viewcontroller;
[self.window makekeyandvisible];
return yes;
}
- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions
{
//创建自己命名的队列
dispatch_queue_t firstserialqueue = dispatch_queue_create("zyappdelegate.gcd.serialqueue1", 0);
//执行block
dispatch_async(firstserialqueue, ^{
nsuinteger counter = 0;
for (counter = 0;counter < 5;counter++){
nslog(@"first iteration, counter = %lu", (unsigned long)counter);
} });
dispatch_async(firstserialqueue, ^{
nsuinteger counter = 0;
for (counter = 0;
counter < 5;
counter++){
nslog(@"second iteration, counter = %lu", (unsigned long)counter);
} });
dispatch_async(firstserialqueue, ^{
nsuinteger counter = 0;
for (counter = 0;
counter < 5;
counter++){
nslog(@"third iteration, counter = %lu", (unsigned long)counter);
} });
//释放队列
dispatch_release(firstserialqueue);
self.window = [[[uiwindow alloc] initwithframe:[[uiscreen mainscreen] bounds]] autorelease];
// override point for customization after application launch.
self.viewcontroller = [[[zyviewcontroller alloc] initwithnibname:@"zyviewcontroller" bundle:nil] autorelease];
self.window.rootviewcontroller = self.viewcontroller;
[self.window makekeyandvisible];
return yes;
}
运行后控制台结果
2013-05-12 11:41:59.221 gcdqueuetest2[1030:1303] first iteration, counter = 0
2013-05-12 11:41:59.223 gcdqueuetest2[1030:1303] first iteration, counter = 1
2013-05-12 11:41:59.223 gcdqueuetest2[1030:1303] first iteration, counter = 2
2013-05-12 11:41:59.224 gcdqueuetest2[1030:1303] first iteration, counter = 3
2013-05-12 11:41:59.225 gcdqueuetest2[1030:1303] first iteration, counter = 4
2013-05-12 11:41:59.226 gcdqueuetest2[1030:1303] second iteration, counter = 0
2013-05-12 11:41:59.227 gcdqueuetest2[1030:1303] second iteration, counter = 1
2013-05-12 11:41:59.228 gcdqueuetest2[1030:1303] second iteration, counter = 2
2013-05-12 11:41:59.229 gcdqueuetest2[1030:1303] second iteration, counter = 3
2013-05-12 11:41:59.230 gcdqueuetest2[1030:1303] second iteration, counter = 4
2013-05-12 11:41:59.232 gcdqueuetest2[1030:1303] third iteration, counter = 0
2013-05-12 11:41:59.232 gcdqueuetest2[1030:1303] third iteration, counter = 1
2013-05-12 11:41:59.233 gcdqueuetest2[1030:1303] third iteration, counter = 2
2013-05-12 11:41:59.233 gcdqueuetest2[1030:1303] third iteration, counter = 3
2013-05-12 11:41:59.234 gcdqueuetest2[1030:1303] third iteration, counter = 4