iOS 扇形点击位置

浅浅的花香味﹌ 2022-06-02 10:05 316阅读 0赞

1.先创建一个view试图

\#import <UIKit/UIKit.h>

@interface Draw : UIView

@end

\#import "Draw.h"

@implementation Draw

/\*

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

\*/

\- (void)drawRect:(CGRect)rect \{

// Drawing code

CGContextRef context = UIGraphicsGetCurrentContext();

//画大圆并填充颜

UIColor\*aColor = \[UIColorcolorWithRed:1green:0.0blue:0alpha:1\];

CGContextSetFillColorWithColor(context, aColor.CGColor);//填充颜色

CGContextSetLineWidth(context, 3.0);//线的宽度

//画笑脸弧线

//左

CGContextSetRGBStrokeColor(context, 1, 0, 1, 1);//改变画笔

/\*画扇形和椭圆\*/

//画扇形，也就画圆，只不过是设置角度的大小，形成一个扇形

aColor = \[UIColorcolorWithRed:0green:1blue:1alpha:1\];

CGContextSetFillColorWithColor(context, aColor.CGColor);//填充颜色

//以10为半径围绕圆心画指定角度扇形

CGContextMoveToPoint(context, 200,  200);

CGContextAddArc(context, 200, 200, 100,  0 \* M\_PI / 180, 90 \* M\_PI / 180, 0);

CGContextClosePath(context);

CGContextDrawPath(context, kCGPathFillStroke);  //绘制路径

CGContextMoveToPoint(context, 200,  200);

CGContextAddArc(context, 200, 200, 100,  90 \* M\_PI / 180, 180 \* M\_PI / 180, 0);

CGContextClosePath(context);

CGContextDrawPath(context, kCGPathFillStroke);

CGContextMoveToPoint(context, 200,  200);

CGContextAddArc(context, 200, 200, 100,  180 \* M\_PI / 180, 270 \* M\_PI / 180, 0);

CGContextClosePath(context);

CGContextDrawPath(context, kCGPathFillStroke);

CGContextMoveToPoint(context, 200,  200);

CGContextAddArc(context, 200, 200, 100,  270 \* M\_PI / 180, 360 \* M\_PI / 180, 0);

CGContextClosePath(context);

CGContextDrawPath(context, kCGPathFillStroke);

@end

2.在要用到的地方创建一下

Draw \*draw1 = \[\[Drawalloc\]initWithFrame:CGRectMake(0, 0, 300, 300)\];

draw1.backgroundColor = \[UIColorclearColor\];

UITapGestureRecognizer \*tap1 = \[\[UITapGestureRecognizeralloc\]initWithTarget:selfaction:@selector(tap:)\];

\[draw1 addGestureRecognizer:tap1\];

\[self.viewaddSubview:draw1\];

\- (void)tap:(UITapGestureRecognizer \*)tap

CGPoint point = \[tap locationInView:self.view\];

NSLog(@"。。。触点的位置%@",NSStringFromCGPoint(point));

CGPoint centerPoint = CGPointMake(200, 200);

NSLog(@"。。。中心点的坐标%@",NSStringFromCGPoint(centerPoint));

CGPoint startPoint = CGPointMake(300, 200);

CGFloat distance = \[selfdistanceFromPointX:point distanceToPointY:centerPoint\];

CGFloat rads = \[selfradiansToDegreesFromPointX:point ToPointY:startPoint  ToCenter:centerPoint\];

NSLog(@"%.2f",rads);

if (rads>0&&rads<=1.57) \{

NSLog(@"11");

\};

if (rads>1.57&&rads<=3.14) \{

NSLog(@"22");

\};

if (rads>3.14&&rads<=4.71) \{

NSLog(@"33");

\};

if (rads>4.71) \{

NSLog(@"44");

\};

\#pragma mark - 计算触点和中心点的弧度

\-(float)radiansToDegreesFromPointX:(CGPoint)start ToPointY:(CGPoint)end ToCenter:(CGPoint)center\{

float rads;

CGFloat a = (end.x \- center.x);

CGFloat b = (end.y \- center.y);

CGFloat c = (start.x\- center.x);

CGFloat d = (start.y\- center.y);

rads = acos(((a\*c) + (b\*d)) / ((sqrt(a\*a + b\*b)) \* (sqrt(c\*c + d\*d))));

NSLog(@"--%f,%f",start.x,center.x);

if (start.y < center.y) \{

rads = 2\*M\_PI \- rads;

return rads;

\#pragma mark - 计算触点到中心点的距离

\-(float)distanceFromPointX:(CGPoint)start distanceToPointY:(CGPoint)end\{

float distance;

CGFloat xDist = (end.x \- start.x);

CGFloat yDist = (end.y \- start.y);

distance = sqrt((xDist \* xDist) + (yDist \* yDist));

return distance;

iOS 扇形点击位置

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