Iphone 在ios7中绘制时滞后
我有一个应用程序,在其中我在视图上做一些草图 到目前为止,它工作正常,直到我安装了Iphone 在ios7中绘制时滞后,iphone,ios,objective-c,drawing,ios7,Iphone,Ios,Objective C,Drawing,Ios7,我有一个应用程序,在其中我在视图上做一些草图 到目前为止,它工作正常,直到我安装了ios7 我的应用程序使用触摸移动方法来识别移动的变化。但当我画一条线时,会调用touch方法,但直到touch在ios7中结束时,该线才得到更新 所以在绘图上有点滞后 它在ios6和ios7模拟器上运行良好,但当我在真正的ios7设备上测试它时,绘图算法存在滞后 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { if (!isIm
ios7
我的应用程序使用触摸移动方法来识别移动的变化。但当我画一条线时,会调用touch方法,但直到touch在ios7
中结束时,该线才得到更新
所以在绘图上有点滞后
它在ios6
和ios7
模拟器上运行良好,但当我在真正的ios7
设备上测试它时,绘图算法存在滞后
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if (!isImageSelection) {
mouseSwiped = NO;
UITouch *touch = [touches anyObject];
if ( [touch view] != baseview) {
lastPoint2 = [touch locationInView:self.viewDrawing2];
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if (!isImageSelection) {
// NSLog(@"in image selection==%d touch moved ",isImageSelection );
mouseSwiped = YES;
UITouch *touch = [touches anyObject];
// if (([touch view] != btnInkColor) || ([touch view] != btnPenSize) || ([touch view] != baseview)) {
if ( [touch view] != baseview) {
CGPoint currentPoint = [touch locationInView:self.viewDrawing];
if(isEraser) {
// [[NSUserDefaults standardUserDefaults] floatForKey:@"strokeValue"];
UIGraphicsBeginImageContext(self.viewDrawing.frame.size);
[imgDrawing.image drawInRect:CGRectMake(0, 0, self.viewDrawing.frame.size.width, self.viewDrawing.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), stroke);
//uncommented by prerak
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), red, green, blue, 1.0);
CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeClear);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
imgDrawing.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
} else {
float strokeT= [[NSUserDefaults standardUserDefaults] floatForKey:@"strokeValue"];
// NSLog(@"strokeT=%f",strokeT);
UIGraphicsBeginImageContext(self.viewDrawing.frame.size);
[imgDrawing.image drawInRect:CGRectMake(0, 0, self.viewDrawing.frame.size.width, self.viewDrawing.frame.size.height)];
// NSLog(@"STROKE %f",stroke);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), strokeT);
CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeCopy);
float redT=[[NSUserDefaults standardUserDefaults] floatForKey:@"redvalue"];
float greenT= [[NSUserDefaults standardUserDefaults] floatForKey:@"greenvalue"];
float blueT= [[NSUserDefaults standardUserDefaults] floatForKey:@"bluevalue"];
// NSLog(@"red=%f",redT);
// NSLog(@"green=%f",greenT);
// NSLog(@"blue=%f",blueT);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), redT, greenT, blueT, 1.0);
CGContextSetRGBFillColor(UIGraphicsGetCurrentContext(), redT, greenT, blueT, 1.0);
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineJoin(UIGraphicsGetCurrentContext(), kCGLineJoinRound);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
imgDrawing.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
lastPoint = currentPoint;
}
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
//if (([touch view] != btnInkColor) || ([touch view] != btnPenSize) || ([touch view] != baseview)) {
if ( [touch view] != baseview) {
if (!isImageSelection) {
if(!mouseSwiped) {
if (isEraser) {
UIGraphicsBeginImageContext(self.viewDrawing.frame.size);
[imgDrawing.image drawInRect:CGRectMake(0, 0, self.viewDrawing.frame.size.width, self.viewDrawing.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), stroke);
// CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), red, green, blue, 1.0);
CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeClear);
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
CGContextFlush(UIGraphicsGetCurrentContext());
imgDrawing.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
} else {
UIGraphicsBeginImageContext(self.viewDrawing.frame.size);
[imgDrawing.image drawInRect:CGRectMake(0, 0, self.viewDrawing.frame.size.width, self.viewDrawing.frame.size.height)];
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), stroke);
CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeCopy);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), red, green, blue, 1.0);
CGContextSetRGBFillColor(UIGraphicsGetCurrentContext(), red, green, blue, 1.0);
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineJoin(UIGraphicsGetCurrentContext(), kCGLineJoinRound);
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
CGContextFlush(UIGraphicsGetCurrentContext());
imgDrawing.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
}
}
}
}
}
如何解决这个问题?这里列出了ios7上出现相同问题的相同代码。人们建议将绘图逻辑移到drawRect中:我们使用
dispatch\u async(dispatch\u get\u main\u queue(),^{)解决了这个问题在touchMoved
方法中的code>block如下:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
dispatch_async(dispatch_get_main_queue(), ^{
mouseSwiped = YES;
UITouch *touch = [touches anyObject];
if(touch.view==self.vwSwipePage)
{
return;
}
if(flagIsEraser)
{
CGPoint currentPoint;
if(flagActiveViewPage)
{
currentPoint = [touch locationInView:self.mainImage];
UIGraphicsBeginImageContext(self.mainImage.frame.size);
[self.mainImage.image drawInRect:CGRectMake(0, 0, self.mainImage.frame.size.width, self.mainImage.frame.size.height)];
}
else
{
currentPoint = [touch locationInView:self.mainImage1];
UIGraphicsBeginImageContext(self.mainImage1.frame.size);
[self.mainImage1.image drawInRect:CGRectMake(0, 0, self.mainImage1.frame.size.width, self.mainImage1.frame.size.height)];
}
//clear using circle brush........
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineCap(context, kCGLineCapRound);
CGContextSetLineWidth(context,20);
CGContextSetBlendMode(context, kCGBlendModeClear);
CGContextSetStrokeColorWithColor(context, [[UIColor clearColor] CGColor]);
CGContextBeginPath(context);
CGContextMoveToPoint(context, lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(context, currentPoint.x, currentPoint.y);
CGContextStrokePath(context);
CGContextFlush(context);
if(flagActiveViewPage)
self.mainImage.image = UIGraphicsGetImageFromCurrentImageContext();
else
self.mainImage1.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
lastPoint = currentPoint;
}
});
}
愿这能帮助你解决你的问题
谢谢要找到即时解决方案,请更换此线路
mainImage.image = UIGraphicsGetImageFromContext(UIGraphicsGetCurrentContext());
与
如果您需要详细而准确的解决方案,请尝试用CGMutablepath替换MoveTo。
希望这能有所帮助。我不知道你是怎么想到这个主意的。但是绘图的代码应该是drawRect方法而不是touch方法。通过使用CGMutablePathRef,我解决了上面的问题。你能通过我上面放的一些代码来显示这一点吗?谢谢你的回复。但是你能建议如何把这段代码放在draw-rect方法中吗?我现在自己在寻找答案:)我会在意识到如何时尽快发布,我会尝试让你知道。谢谢你的回复。非常感谢,这有点帮助,但如果你更换了it技术人员提到的那条线路,那就太完美了+1谢谢你的帮助。我也检查了使用itechnician提到的这条线,真的对我也很好…感谢itechnician之前的方法,我提到过它很好,但使用AddQuadCurveToPoint时,它只显示线而不是平滑线…所以这很完美…再次感谢itechnician。。。
[mainImage performSelectorInBackground:@selector(setImage:) withObject:UIGraphicsGetImageFromCurrentImageContext()];