IOS 如何?畫虛線

IOS 如何?畫虛線
因為項目需要畫虛線，起初想用圖片重複疊加實現。搜羅了一圈還是封裝一個UIView代碼如下
.h檔案

#import @interface DashesLineView : UIView@property(nonatomic)CGPoint startPoint;//虛線起點@property(nonatomic)CGPoint endPoint;//虛線終點@property(nonatomic,strong)UIColor* lineColor;//虛線顏色@end

.m檔案

#import DashesLineView.h#define kInterval 10                                // 全域間距@implementation DashesLineView- (id)initWithFrame:(CGRect)frame{    self= [super initWithFrame:frame];    if(self) {        _lineColor = [UIColor redColor];        _startPoint = CGPointMake(0, 1);        _endPoint = CGPointMake(screen_width , 1);                    }    return self;}- (void)drawRect:(CGRect)rect {        CGContextRef context = UIGraphicsGetCurrentContext();        CGContextBeginPath(context);        CGContextSetLineWidth(context,0.5);//線寬度        CGContextSetStrokeColorWithColor(context,self.lineColor.CGColor);        CGFloat lengths[] = {4,2};//先畫4個點再畫2個點        CGContextSetLineDash(context,0, lengths,2);//注意2(count)的值等於lengths數組的長度        CGContextMoveToPoint(context,self.startPoint.x,self.startPoint.y);        CGContextAddLineToPoint(context,self.endPoint.x,self.endPoint.y);        CGContextStrokePath(context);        CGContextClosePath(context);    }@end