[英]Doesn't work NSQueue
I have a problem which I find it difficult to solve itself therefore I ask for your help. 我有一个很难解决的问题,因此请您帮忙。
in FirstViewController.m (FVC) 在FirstViewController.m(FVC)中
if (..............) {
[self performSegueWithIdentifier:@"SVC" sender:self];//SecondViewController
}
in SVC.h 在SVC.h中
......
- (void)blinkPic;
......
in SVC.m 在SVC.m中
- (void)viewDidLoad
{
[super viewDidLoad];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
.......
for (int i = 0; i < _picForDisplay.length; i++) { //picForDisplay can be from 0 to 10
_forBlink = ......; // number of picture
NSOperation *operation = [[NSInvocationOperation alloc]
initWithTarget:self
selector:@selector(blinkPic)
object:nil];
[queue addOperation:operation];
}
.......
}
- (void)blinkPic
{
for (int i = 0; i < 18; i++) {
if ( (i % 2 ) == 0 ){
UIImageView *Pic = [self valueForKey:[NSString stringWithFormat:@"Pic%i", _forBlink]];
[Pic performSelectorOnMainThread:@selector(setImage:) withObject:[UIImage imageNamed:@"1.png"] waitUntilDone:YES];
} else {
UIImageView *Pic = [self valueForKey:[NSString stringWithFormat:@"Pic%i", _forBlink]];
[Pic performSelectorOnMainThread:@selector(setImage:) withObject:[UIImage imageNamed:@"2.png"] waitUntilDone:YES];
}
[NSThread sleepForTimeInterval:0.1f];
}
}
if i more than 1 that has to be created some threads and for everyone to be caused the blinkPic method, where the pictures(Pic) with specified number has to change 18 times the image - to blink. 如果我必须创建一个以上的线程,并且每个人都需要使用bickerPic方法,则具有指定编号的picture(Pic)必须更改图像的18倍-才能闪烁。
The problem - if the picture one (i=0), performance of the blinkPic method passes perfectly and the picture "blinks" 问题-如果图片一(i = 0),blinkPic方法的性能通过完美,图片“闪烁”
If pictures there is more (i=1 or 2 or 3 etc), the blinkPic method is executed always for the last picture, all the others remain without changes. 如果有更多图片(i = 1或2或3等),则始终对最后一张图片执行blinkPic方法,所有其他图片保持不变。 Why the blinkPic method isn't executed for all pictures when their more than one?
为什么当所有图片都不止一个时不对所有图片都执行blinkPic方法? But only for the last ((
但仅适用于最后((
for (int i = 0; i < _picForDisplay.length; ++i) { //picForDisplay can be from 0 to 10
NSOperation *operation = [[NSInvocationOperation alloc]
initWithTarget:self
selector:@selector(blinkPic:)
object:@(i)];
[queue addOperation:operation];
}
.......
}
- (void)blinkPic:(NSNumber*) forBlink
{
for (int i = 0; i < 18; i++) {
if ( (i % 2 ) == 0 ){
UIImageView *Pic = [self valueForKey:[NSString stringWithFormat:@"Pic%@", forBlink]];
[Pic performSelectorOnMainThread:@selector(setImage:) withObject:[UIImage imageNamed:@"1.png"] waitUntilDone:YES];
} else {
UIImageView *Pic = [self valueForKey:[NSString stringWithFormat:@"Pic%@", forBlink]];
[Pic performSelectorOnMainThread:@selector(setImage:) withObject:[UIImage imageNamed:@"2.png"] waitUntilDone:YES];
}
[NSThread sleepForTimeInterval:0.1f];
}
}
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