如何在iOS设备上绘制波浪线

Question

我有很多构建线的要点。我怎样才能通过这些点画出一条波浪线？

Answer 1

例子：

- (void)drawRect:(NSRect)rect 
{ 
    NSBezierPath *curve = [NSBezierPath bezierPath]; 
    [curve moveToPoint:NSMakePoint(0,50)]; 
    [curve relativeCurveToPoint:NSMakePoint(150,50) controlPoint1:NSMakePoint(50,100) controlPoint2:NSMakePoint(100,0)]; 
    [[NSColor redColor] set]; 
    [curve stroke]; 
} 

结果：

Answer 2

创建NSBezierPath，并使用您的点作为控制点。

Answer 3

在iOS上使用CGContextRef。

WavyView.h

#import <UIKit/UIKit.h> 

@interface WavyView : UIView { 

} 

@end 

WavyView.m

#import "WavyView.h" 

@implementation WavyView 

- (id)initWithFrame:(CGRect)frame { 
    self = [super initWithFrame:frame]; 
    return self; 
} 

- (void)drawRect:(CGRect)rect { 
    CGContextRef context = UIGraphicsGetCurrentContext(); 
    CGContextSetLineWidth(context, 2.0); 
    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor); 
    CGContextBeginPath(context); 
    CGContextMoveToPoint(context, 100, 100); 
    CGContextAddCurveToPoint(context,125,150,175,150,200,100); 
    CGContextAddCurveToPoint(context,225,50,275,75,300,200); 
    CGContextStrokePath(context); 
} 

- (void)dealloc { 
    [super dealloc]; 
} 

@end 

结果：