我正在使用 CorePlot 库绘制实时心电图。当它在 iPad air 中使用时，性能还可以。但是当我尝试时它与 iPad mini，绘图有延迟。我已经完成了 collapseLayer 和 this link也。这并没有解决我的问题。任何人都可以为此提出新的解决方案。
我的代码如下:
-(void)newData:(NSTimer *)theTimer
{
for (int i =0;i<plotcount;i++){
if([Qrrch0 count]>0 || [Qrrch1 count]>0 || [Qrrch2 count]>0 || [Qrrch3 count]>0 || [Qrrspo2 count]>0 ){
if(g1==1 && thePlot){
currentIndex ++;
}
if(g2==1 && thePlot1){
currentIndex1 ++;
}
if(g3==1 && thePlot2){
currentIndex2 ++;
}
if(g4==1 && thePlot3){
currentIndex3 ++;
}
if(spo2==1 && thePlot4){
currentIndex4 ++;
}
if(arrayIndex>=kchannel1-1)
{
arrayIndex=0;
}
if(arrayIndex1>=kchannel2-1)
{
arrayIndex1=0;
}
if(arrayIndex>=kchannel1-1)
{
arrayIndex=0;
}
if(arrayIndex2>=kchannel3-1)
{
arrayIndex2=0;
}
if(arrayIndex3>=kchannel4-1)
{
arrayIndex3=0;
}
if(arrayIndex4>=kchannel5-1)
{
arrayIndex4=0;
}
if(g1==1 && thePlot){
currentIndex5++;
if(currentIndex5>=kchannel1)
{
if(arrayIndex==0)
{
[thePlot reloadDataInIndexRange:NSMakeRange(arrayIndex, arrayIndex)];
}else{
[thePlot deleteDataInIndexRange:NSMakeRange(arrayIndex, 1)];
}
}
if([Qrrch0 count]!=0)
{
arrPlot[arrayIndex]=[[Qrrch0 objectAtIndex:0] integerValue];
lastPlot0=[Qrrch0 objectAtIndex:0];
}else{
arrPlot[arrayIndex]=[lastPlot0 integerValue];
}
arrayIndex++;
}
if(g2==1 && thePlot1){
currentIndex6++;
if(currentIndex6>=kchannel2)
{
if(arrayIndex1==0)
{
[thePlot1 reloadDataInIndexRange:NSMakeRange(arrayIndex1, arrayIndex1)];
}else{
[thePlot1 deleteDataInIndexRange:NSMakeRange(arrayIndex1, 1)];
}
}
if([Qrrch1 count]!=0)
{
arrPlot1[arrayIndex1]=[[Qrrch1 objectAtIndex:0] integerValue];
lastPlot1=[Qrrch1 objectAtIndex:0];
}else{
arrPlot1[arrayIndex1]=[lastPlot1 integerValue];
}
arrayIndex1++;
}
if(g3==1 && thePlot2){
currentIndex7++;
if(currentIndex7>=kchannel3)
{
if(arrayIndex2==0)
{
[thePlot2 reloadDataInIndexRange:NSMakeRange(arrayIndex2, arrayIndex2)];
}else{
[thePlot2 deleteDataInIndexRange:NSMakeRange(arrayIndex2, 1)];
}
}
if([Qrrch2 count]!=0)
{
arrPlot2[arrayIndex2]=[[Qrrch2 objectAtIndex:0] integerValue];
lastPlot2=[Qrrch2 objectAtIndex:0];
}else{
arrPlot2[arrayIndex2]=[lastPlot2 integerValue];
}
arrayIndex2++;
}
if(g4==1 && thePlot3){
currentIndex8++;
if(currentIndex8>=kchannel4)
{
if(arrayIndex3==0)
{
[thePlot3 reloadDataInIndexRange:NSMakeRange(arrayIndex3, arrayIndex3)];
}else{
[thePlot3 deleteDataInIndexRange:NSMakeRange(arrayIndex3, 1)];
}
}
if([Qrrch3 count]!=0)
{
arrPlot3[arrayIndex3]=[[Qrrch3 objectAtIndex:0] integerValue];
lastPlot3=[Qrrch3 objectAtIndex:0];
}else{
arrPlot3[arrayIndex3]=[lastPlot3 integerValue];
}
arrayIndex3++;
}
if(spo2==1 && thePlot4){
currentIndex9++;
if(currentIndex9>=kchannel5)
{
if(arrayIndex4==0)
{
[thePlot4 reloadDataInIndexRange:NSMakeRange(arrayIndex4, arrayIndex4)];
}else{
[thePlot4 deleteDataInIndexRange:NSMakeRange(arrayIndex4, 1)];
}
}
if([Qrrspo2 count]!=0)
{
arrPlot4[arrayIndex4]=[[Qrrspo2 objectAtIndex:0] integerValue];
lastPlot4=[Qrrspo2 objectAtIndex:0];
}else{
arrPlot4[arrayIndex4]=[lastPlot4 integerValue];
}
arrayIndex4++;
}
if(g1==1 && thePlot){
if([Qrrch0 count]!=0)
{
[Qrrch0 removeObjectAtIndex:0];
}
if(currentIndex>=kchannel1)
{
currentIndex=1;
}
[thePlot insertDataAtIndex:currentIndex-1 numberOfRecords:1];
}
if(g2==1 && thePlot1){
if([Qrrch1 count]!=0)
{
[Qrrch1 removeObjectAtIndex:0];
}
if(currentIndex1>=kchannel2)
{
currentIndex1=1;
}
[thePlot1 insertDataAtIndex:currentIndex1-1 numberOfRecords:1];
}
if(g3==1 && thePlot2){
if([Qrrch2 count]!=0)
{
[Qrrch2 removeObjectAtIndex:0];
}
if(currentIndex2>=kchannel3)
{
currentIndex2=1;
}
[thePlot2 insertDataAtIndex:currentIndex2-1 numberOfRecords:1];
}
if(g4==1 && thePlot3){
if([Qrrch3 count]!=0)
{
[Qrrch3 removeObjectAtIndex:0];
}
if(currentIndex3>=kchannel4)
{
currentIndex3=1;
}
[thePlot3 insertDataAtIndex:currentIndex3-1 numberOfRecords:1];
}
if(spo2==1 && thePlot4){
if([Qrrspo2 count]!=0)
{
[Qrrspo2 removeObjectAtIndex:0];
}
if(currentIndex4>=kchannel5)
{
currentIndex4=1;
}
[thePlot4 insertDataAtIndex:currentIndex4-1 numberOfRecords:1];
}
}
else
{
[self datacha];
}
}
}
-(void) datacha{
NSArray *array;
if([FinalArray count]>0){
if(g1==1 && thePlot){
array = [[NSArray alloc] initWithArray:[FinalArray objectAtIndex:0]];
[Qrrch0 addObjectsFromArray:array];
}
if(g1==1 && thePlot){
[FinalArray removeObjectAtIndex:0];
}
}
if([FinalArray1 count]>0){
if(g2==1 && thePlot1){
array = [[NSArray alloc] initWithArray:[FinalArray1 objectAtIndex:0]];
[Qrrch1 addObjectsFromArray:array];
}
if(g2==1 && thePlot1){
[FinalArray1 removeObjectAtIndex:0];
}
}
if([FinalArray2 count]>0){
if(g3==1 && thePlot2){
array = [[NSArray alloc] initWithArray:[FinalArray2 objectAtIndex:0]];
[Qrrch2 addObjectsFromArray:array];
}
if(g3==1 && thePlot2){
[FinalArray2 removeObjectAtIndex:0];
}
} if([FinalArray3 count]>0){
if(g4==1 && thePlot3){
array = [[NSArray alloc] initWithArray:[FinalArray3 objectAtIndex:0]];
[Qrrch3 addObjectsFromArray:array];
}
if(g4==1 && thePlot3){
[FinalArray3 removeObjectAtIndex:0];
}
}
if([FinalArray4 count]>0){
if(spo2==1 && thePlot4){
array = [[NSArray alloc] initWithArray:[FinalArray4 objectAtIndex:0]];
[Qrrspo2 addObjectsFromArray:array];
}
if(spo2==1 && thePlot4){
[FinalArray4 removeObjectAtIndex:0];
}
}
}
#pragma mark -
#pragma mark Plot Data Source Methods
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
if(plot == thePlot)
{
if(currentIndex5>=kchannel1)
{
return kchannel1;
}else{
return currentIndex5;
}
}
if(plot == thePlot1)
{
if(currentIndex6>=kchannel2)
{
return kchannel2;
}else{
return currentIndex6;
}
}
if(plot == thePlot2)
{
if(currentIndex7>=kchannel3)
{
return kchannel3;
}else{
return currentIndex7;
}
}
if(plot == thePlot3)
{
if(currentIndex8>=kchannel4)
{
return kchannel4;
}else{
return currentIndex8;
}
}
if(plot == thePlot4)
{
if(currentIndex9>=kchannel5)
{
return kchannel5;
}else{
return currentIndex9;
}
}
return 0;
}
-(double)doubleForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)idx{
double num;
NSString *textval = [NSString stringWithFormat:@"%d", countofpktloss];
self.losscount.text = textval;
switch ( fieldEnum ) {
case CPTScatterPlotFieldX:
if(plot == thePlot){
num =currentIndex;
}
else if(plot == thePlot1)
{
num = currentIndex1;
}
else if(plot == thePlot2)
{
num = currentIndex2;
}
else if(plot == thePlot3)
{
num = currentIndex3;
}
else if(plot == thePlot4)
{
num = currentIndex4;
}
break;
case CPTScatterPlotFieldY:
if(plot == thePlot){
num =arrPlot[idx];
}
else
if(plot == thePlot1){
num =arrPlot1[idx];
}
else if(plot == thePlot2){
num =arrPlot2[idx];
}
else if(plot == thePlot3)
{
num =arrPlot3[idx];
}
else if(plot == thePlot4)
{
num =arrPlot4[idx];
}
break;
default:
break;
}
return num;
}
最佳答案
collapsesLayers 属性有助于为静态图节省内存。在频繁更新的图形上使用它会使性能变差，因为它需要图形重新绘制所有内容，而不仅仅是更改的部分，例如绘图。
已添加评论
确保计时器在您期望的时间停止。否则，它将继续向图中添加点。
计时器多久触发一次以向地 block 添加点数？每秒更新图表超过 60 次是没有意义的，您可能需要在 iPad 2 等旧设备上进一步减少更新次数，以获得具有大量数据点的良好性能。如果需要，您可以在每次更新中添加多个点。
检查用于重新加载数据点的范围。您传递的数字与范围的位置和长度相同。我怀疑您的意思是对每个范围使用一 (1) 的长度。如果是这样，您将重新加载比每次传递所需的更多数据。
关于ios - 提高核心情节的表现，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31669879/