Собственно, в ImageView ViewController'a, пользователь может рисовать линии и элипсы. В методе touchesMoved постоянно создается куча image, которые забивают оперативку. Как этого избежать?
@interface ViewController ()
@end
@implementation ViewController
@synthesize drawImage;
@synthesize segments;
- (void)viewDidLoad
{
[super viewDidLoad];
[Singleton sharedMySingleton].arrayMain=[[NSMutableArray alloc] init];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
#define RAND_FROM_TO(min, max) (min + arc4random_uniform(max - min + 1))
#define RGB(r, g, b) [UIColor colorWithRed:(float)r / 255.0 green:(float)g / 255.0 blue:(float)b / 255.0 alpha:1.0]
#define RGBA(r, g, b, a) [UIColor colorWithRed:(float)r / 255.0 green:(float)g / 255.0 blue:(float)b / 255.0 alpha:a]
int Integer = RAND_FROM_TO(0, 7);
if (segments.selectedSegmentIndex==0) {
alpha=1.0f;
}
else if (segments.selectedSegmentIndex==1)
{
}
if (Integer==0)
{
tempcolor=RGBA(255.0f, 255.0f, 0.0f, alpha);
}
else if (Integer==1)
{
tempcolor=RGBA(255.0f, 0.0f, 0.0f,alpha);
}
else if (Integer==2)
{
tempcolor=RGBA(0.0f, 255.0f, 0.0f,alpha);
}
else if (Integer==3)
{
tempcolor=RGBA(0.0f, 255.0f, 255.0f,alpha);
}
else if (Integer==4)
{
tempcolor=RGBA(0.0f, 0.0f, 255.0f,alpha);
}
else if (Integer==5)
{
tempcolor=RGBA(0.0f, 128.0f, 0.0f,alpha);
}
else if (Integer==6)
{
tempcolor=RGBA(0.0f, 128.0f, 128.0f,alpha);
}
else if (Integer==7)
{
tempcolor=RGBA(255.0f, 0.0f, 255.0f,alpha);
}
[Singleton sharedMySingleton].colorNumber=tempcolor;
UITouch *touch = [touches anyObject];
if (touch.tapCount == 1) {
lastPoint = [touch locationInView:self.drawImage];
} else
{
drawImage.image = nil;
}
image = drawImage.image;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self.drawImage];
UIGraphicsBeginImageContextWithOptions(self.drawImage.frame.size, NO, [[UIScreen mainScreen] scale]);
CGRect drawRect = CGRectMake(0.0f, 0.0f,
self.drawImage.frame.size.width,
self.drawImage.frame.size.height);
[image drawInRect:drawRect];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 1.0f);
CGContextBeginPath(UIGraphicsGetCurrentContext());
if (segments.selectedSegmentIndex==0) {
CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [tempcolor CGColor]);
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
firstPoint=lastPoint;
endPoint=currentPoint;
}
if (segments.selectedSegmentIndex==1)
{
CGFloat alphas=( arc4random() % 256 / 256.0 );
if (alphas<0.3f) {
alpha=alphas+0.3f;
}
else if (alphas>0.7f) {
alpha=alphas-0.3f;
}
CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [tempcolor CGColor]);
if (touches.count == 2) {
UITouch *touch1 = [touches allObjects][0];
UITouch *touch2 = [touches allObjects][1];
CGPoint currentPoint1 = [touch1 locationInView:drawImage.superview];
CGPoint currentPoint2 = [touch2 locationInView:drawImage.superview];
firstPoint=currentPoint1;;
endPoint=currentPoint2;
CGPoint one=currentPoint1;
CGPoint two=currentPoint2;
CGFloat h=two.y-one.y;
CGFloat w=two.x-one.x;
CGRect rectangle = CGRectMake(one.x, one.y, w, h);
CGContextAddEllipseInRect(UIGraphicsGetCurrentContext(), rectangle);
}
else {
return;
}
}
CGContextStrokePath(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
if (firstPoint.x!=endPoint.x&&firstPoint.y!=endPoint.y) {
float temp=pow(firstPoint.x-endPoint.x,2)-pow(firstPoint.y-endPoint.y, 2);
double length=pow(fabsf(temp),0.5);
[Singleton sharedMySingleton].length=[[NSNumber numberWithFloat:length] stringValue];
[Singleton sharedMySingleton].firstX=[[NSNumber numberWithFloat:(int)firstPoint.x] stringValue];
[Singleton sharedMySingleton].firstY=[[NSNumber numberWithFloat:(int)firstPoint.y] stringValue];
[Singleton sharedMySingleton].lastX=[[NSNumber numberWithFloat:(int)endPoint.x] stringValue];
[Singleton sharedMySingleton].lastY=[[NSNumber numberWithFloat:(int)endPoint.y] stringValue];
if (segments.selectedSegmentIndex==0) {
[Singleton sharedMySingleton].elementNаme=@"Line";
}
if (segments.selectedSegmentIndex==1) {
[Singleton sharedMySingleton].elementNаme=@"Ellipse";
}
NSArray *data=[NSArray arrayWithObjects:[Singleton sharedMySingleton].firstX,[Singleton sharedMySingleton].firstY,[Singleton sharedMySingleton].lastX,[Singleton sharedMySingleton].lastY,[Singleton sharedMySingleton].length,[Singleton sharedMySingleton].colorNumber,[Singleton sharedMySingleton].elementNаme, nil];
NSUInteger number=[Singleton sharedMySingleton].arrayMain.count;
[[Singleton sharedMySingleton].arrayMain insertObject:data atIndex:number];
if ([Singleton sharedMySingleton].arrayMain.count>=2)
{
if ([[data objectAtIndex:2]floatValue]==0.0f&&[[data objectAtIndex:3]floatValue]==0.0f)
{
[[Singleton sharedMySingleton].arrayMain removeObjectAtIndex:number];
}
}
firstPoint.x=0.0f;
firstPoint.y=0.0f;
endPoint.x=0.0f;
endPoint.y=0.0f;
[[NSNotificationCenter defaultCenter] postNotificationName:@"reloadTable"
object:self];
}
}
@end
Средний
