drawtestViewController.mのボタンは、ChalkBoard.mのpushPointアクションにリンクされています。pointArrayにCGpointオブジェクトを入力します。この配列は、drawRectから表示した場合を除いて、どこにでもオブジェクトでいっぱいです。drawRectから、元の配列の空のコピーを参照しているようですが、エラーが見つかりません...
プロジェクト全体をhttp://dl.dropbox.com/u/42099382/drawtest.zipにアップロードしました
drawtestViewController.mのボタンアクション
- (IBAction)myDo {
NSLog(@"-Button was pressed");
[self.board pushPoint:CGPointMake(100, 100 )];
[self.board pushPoint:CGPointMake(10, 100 )];
[self.graphicView setNeedsDisplay];
}
// ChalkBoard.h
#import <UIKit/UIKit.h>
@interface ChalkBoard : UIView
-(void)pushPoint:(CGPoint)point;
@property (nonatomic,retain) NSMutableArray *pointArray;
@end
//ChalkBoard.m
#import "ChalkBoard.h"
@implementation ChalkBoard
@synthesize pointArray;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor blackColor];
}
return self;
}
-(NSMutableArray *)pointArray
{
if(pointArray == nil) pointArray = [[NSMutableArray alloc]initWithCapacity:10];
return pointArray;
}
-(void)pushPoint:(CGPoint)point{
// this is called from drawtestViewController.m by button press
// in here the array is full and growing by each button press
[self.pointArray addObject:[NSValue valueWithCGPoint:point]];
NSLog(@"-pushPoint executed, size is %u, array: %@",[self.pointArray count], pointArray);
}
- (void)drawRect:(CGRect)rect{
// here array is always empty
NSLog(@"-DrawRect executed, size is %u, array: %@",[pointArray count], pointArray);
if ([pointArray count] >1){
... some irrelevant code
}
}
@end
NSLog output
2012-04-09 11:34:39.145 drawtest[5260:f803] -DrawRect executed, size is 0, array: (null)
2012-04-09 11:34:41.261 drawtest[5260:f803] -Button was pressed
2012-04-09 11:34:41.262 drawtest[5260:f803] -pushPoint executed, size is 1, array: (
"NSPoint: {100, 100}"
)
2012-04-09 11:34:41.264 drawtest[5260:f803] -pushPoint executed, size is 2, array: (
"NSPoint: {100, 100}",
"NSPoint: {10, 100}"
)
2012-04-09 11:34:41.266 drawtest[5260:f803] -DrawRect executed, size is 0, array: (null)
2012-04-09 11:34:42.825 drawtest[5260:f803] -Button was pressed
2012-04-09 11:34:42.826 drawtest[5260:f803] -pushPoint executed, size is 3, array: (
"NSPoint: {100, 100}",
"NSPoint: {10, 100}",
"NSPoint: {100, 100}"
)
2012-04-09 11:34:42.827 drawtest[5260:f803] -pushPoint executed, size is 4, array: (
"NSPoint: {100, 100}",
"NSPoint: {10, 100}",
"NSPoint: {100, 100}",
"NSPoint: {10, 100}"
)
2012-04-09 11:34:42.829 drawtest[5260:f803] -DrawRect executed, size is 0, array: (null)