通过NSTimer UserInfo传递数据 [英] Passing Data through NSTimer UserInfo
本文介绍了通过NSTimer UserInfo传递数据的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试通过userInfo传递数据以进行NSTimer调用。做这个的最好方式是什么?我正在尝试使用NSDictionary,当我有Objective-C对象时这很简单,但其他数据呢?我想做这样的事情,它不能正常工作:
I am trying to pass data through userInfo for an NSTimer call. What is the best way to do this? I am trying to use an NSDictionary, this is simple enough when I have Objective-C objects, but what about other data? I want to do something like this, which doesn't work as is:
- (void)play:(SystemSoundID)sound target:(id)target callbackSelector:(SEL)selector
{
NSLog(@"pause ipod");
[iPodController pause];
theSound = sound;
NSMutableDictionary *cb = [[NSMutableDictionary alloc] init];
[cb setObject:(id)&sound forKey:@"sound"];
[cb setObject:target forKey:@"target"];
[cb setObject:(id)&selector forKey:@"selector"];
[NSTimer scheduledTimerWithTimeInterval:0
target:self
selector:@selector(notifyPause1:)
userInfo:(id)cb
repeats:NO];
}
推荐答案
你必须包装信息正确进入字典:
You have to wrap the information correctly into the dictionary:
- (void) play:(SystemSoundID)sound target:(id)target callbackSelector:(SEL)selector
{
NSLog(@"pause ipod");
[iPodController pause];
theSound = sound;
NSMutableDictionary *cb = [[NSMutableDictionary alloc] init];
[cb setObject:[NSNumber numberWithInt:sound] forKey:@"sound"];
[cb setObject:target forKey:@"target"];
[cb setObject:NSStringFromSelector(selector) forKey:@"selector"];
[NSTimer scheduledTimerWithTimeInterval:0
target:self
selector:@selector(notifyPause1:)
userInfo:cb
repeats:NO];
[cb release];
}
在 notifyPause1:
,你检索所有东西:
- (void)notifyPause1:(NSTimer *)timer {
NSDictionary *dict = [timer userInfo];
SystemSoundID sound = [[dict objectForKey:@"sound"] intValue];
id target = [dict objectForKey:@"target"];
SEL selector = NSSelectorFromString([dict objectForKey:@"selector"]);
// Do whatever...
}
As计时器是一个重复计时器,你不再需要字典,所以你可以释放它。
As the timer is a repeating timer, you do not need the dictionary anymore, so you can release it.
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