我正在尝试保存一个 CGRect 数组以与 CGContextFillRects 一起使用,但我分配给我的 minorPlotLines 数组的 CGRect 变量似乎没有得到保存。到这里的对象自己绘制的时候,minorPlotLines 是空的!有谁知道发生了什么?
@interface GraphLineView () {
int numberOfLines;
CGRect *minorPlotLines;
}
@end
@implementation GraphLineView
- (instancetype) initWithFrame: (CGRect) frame {
self = [super initWithFrame:frame];
if (self) {
// Init code
[self setupView];
}
return self;
}
- (instancetype) initWithCoder: (NSCoder *) aDecoder {
if(self == [super initWithCoder:aDecoder]){
[self setupView];
}
return self;
}
- (void) dealloc {
free(minorPlotLines);
}
- (void) setupView {
numberOfLines = 40;
minorPlotLines = malloc(sizeof(struct CGRect)*40);
for(int x = 0; x < numberOfLines; x += 2){
//minorPlotLines[x] = *(CGRect*)malloc(sizeof(CGRect));
minorPlotLines[x] = CGRectMake(x*(self.frame.size.width/numberOfLines), 0, 2, self.frame.size.height);
// minorPlotLines[x+1] = *(CGRect*)malloc(sizeof(CGRect));
minorPlotLines[x+1] = CGRectMake(0, x*(self.frame.size.height/numberOfLines), self.frame.size.width, 2);
}
[self setNeedsDisplay];
}
- (void) drawRect:(CGRect)rect {
// Drawing code
[super drawRect:rect];
for(int x = 0; x < numberOfLines; x += 2){
NSLog(@"R %d = %f", x, minorPlotLines[x].origin.x);
NSLog(@"R %d = %f", x+1, minorPlotLines[x+1].origin.y);
}
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [[UIColor yellowColor] CGColor]);
CGContextFillRects(context, minorPlotLines, numberOfLines);
}