Tienes alguna vez has probado this tutorial para tu problema. Esto te ayudará con seguridad.
El archivo .h para calcular el golpe
#import <UIKit/UIKit.h>
#import "SMRotaryProtocol.h"
@interface SMRotaryWheel : UIControl
@property (weak) id <SMRotaryProtocol> delegate;
@property (nonatomic, strong) UIView *container;
@property int numberOfSections;
@property CGAffineTransform startTransform;
@property (nonatomic, strong) NSMutableArray *cloves;
@property int currentValue;
- (id) initWithFrame:(CGRect)frame andDelegate:(id)del withSections:(int)sectionsNumber;
y el archivo .m es
#import "SMRotaryWheel.h"
#import <QuartzCore/QuartzCore.h>
#import "SMCLove.h"
@interface SMRotaryWheel()
- (void)drawWheel;
- (float) calculateDistanceFromCenter:(CGPoint)point;
- (void) buildClovesEven;
- (void) buildClovesOdd;
- (UIImageView *) getCloveByValue:(int)value;
- (NSString *) getCloveName:(int)position;
@end
static float deltaAngle;
static float minAlphavalue = 0.6;
static float maxAlphavalue = 1.0;
@implementation SMRotaryWheel
@synthesize delegate, container, numberOfSections, startTransform, cloves, currentValue;
- (id) initWithFrame:(CGRect)frame andDelegate:(id)del withSections:(int)sectionsNumber {
if ((self = [super initWithFrame:frame])) {
self.currentValue = 0;
self.numberOfSections = sectionsNumber;
self.delegate = del;
[self drawWheel];
}
return self;
}
- (void) drawWheel {
container = [[UIView alloc] initWithFrame:self.frame];
CGFloat angleSize = 2*M_PI/numberOfSections;
for (int i = 0; i < numberOfSections; i++) {
UIImageView *im = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"segment.png"]];
im.layer.anchorPoint = CGPointMake(1.0f, 0.5f);
im.layer.position = CGPointMake(container.bounds.size.width/2.0-container.frame.origin.x,
container.bounds.size.height/2.0-container.frame.origin.y);
im.transform = CGAffineTransformMakeRotation(angleSize*i);
im.alpha = minAlphavalue;
im.tag = i;
if (i == 0) {
im.alpha = maxAlphavalue;
}
UIImageView *cloveImage = [[UIImageView alloc] initWithFrame:CGRectMake(12, 15, 40, 40)];
cloveImage.image = [UIImage imageNamed:[NSString stringWithFormat:@"icon%i.png", i]];
[im addSubview:cloveImage];
[container addSubview:im];
}
container.userInteractionEnabled = NO;
[self addSubview:container];
cloves = [NSMutableArray arrayWithCapacity:numberOfSections];
UIImageView *bg = [[UIImageView alloc] initWithFrame:self.frame];
bg.image = [UIImage imageNamed:@"bg.png"];
[self addSubview:bg];
UIImageView *mask = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 58, 58)];
mask.image =[UIImage imageNamed:@"centerButton.png"] ;
mask.center = self.center;
mask.center = CGPointMake(mask.center.x, mask.center.y+3);
[self addSubview:mask];
if (numberOfSections % 2 == 0) {
[self buildClovesEven];
} else {
[self buildClovesOdd];
}
[self.delegate wheelDidChangeValue:[self getCloveName:currentValue]];
}
- (UIImageView *) getCloveByValue:(int)value {
UIImageView *res;
NSArray *views = [container subviews];
for (UIImageView *im in views) {
if (im.tag == value)
res = im;
}
return res;
}
- (void) buildClovesEven {
CGFloat fanWidth = M_PI*2/numberOfSections;
CGFloat mid = 0;
for (int i = 0; i < numberOfSections; i++) {
SMClove *clove = [[SMClove alloc] init];
clove.midValue = mid;
clove.minValue = mid - (fanWidth/2);
clove.maxValue = mid + (fanWidth/2);
clove.value = i;
if (clove.maxValue-fanWidth < - M_PI) {
mid = M_PI;
clove.midValue = mid;
clove.minValue = fabsf(clove.maxValue);
}
mid -= fanWidth;
NSLog(@"cl is %@", clove);
[cloves addObject:clove];
}
}
- (void) buildClovesOdd {
CGFloat fanWidth = M_PI*2/numberOfSections;
CGFloat mid = 0;
for (int i = 0; i < numberOfSections; i++) {
SMClove *clove = [[SMClove alloc] init];
clove.midValue = mid;
clove.minValue = mid - (fanWidth/2);
clove.maxValue = mid + (fanWidth/2);
clove.value = i;
mid -= fanWidth;
if (clove.minValue < - M_PI) {
mid = -mid;
mid -= fanWidth;
}
[cloves addObject:clove];
NSLog(@"cl is %@", clove);
}
}
- (float) calculateDistanceFromCenter:(CGPoint)point {
CGPoint center = CGPointMake(self.bounds.size.width/2.0f, self.bounds.size.height/2.0f);
float dx = point.x - center.x;
float dy = point.y - center.y;
return sqrt(dx*dx + dy*dy);
}
- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
CGPoint touchPoint = [touch locationInView:self];
float dist = [self calculateDistanceFromCenter:touchPoint];
if (dist < 40 || dist > 100)
{
// forcing a tap to be on the ferrule
NSLog(@"ignoring tap (%f,%f)", touchPoint.x, touchPoint.y);
return NO;
}
float dx = touchPoint.x - container.center.x;
float dy = touchPoint.y - container.center.y;
deltaAngle = atan2(dy,dx);
startTransform = container.transform;
UIImageView *im = [self getCloveByValue:currentValue];
im.alpha = minAlphavalue;
return YES;
}
- (BOOL)continueTrackingWithTouch:(UITouch*)touch withEvent:(UIEvent*)event
{
CGPoint pt = [touch locationInView:self];
float dist = [self calculateDistanceFromCenter:pt];
if (dist < 40 || dist > 100)
{
// a drag path too close to the center
NSLog(@"drag path too close to the center (%f,%f)", pt.x, pt.y);
// here you might want to implement your solution when the drag
// is too close to the center
// You might go back to the clove previously selected
// or you might calculate the clove corresponding to
// the "exit point" of the drag.
}
float dx = pt.x - container.center.x;
float dy = pt.y - container.center.y;
float ang = atan2(dy,dx);
float angleDifference = deltaAngle - ang;
container.transform = CGAffineTransformRotate(startTransform, -angleDifference);
return YES;
}
- (void)endTrackingWithTouch:(UITouch*)touch withEvent:(UIEvent*)event
{
CGFloat radians = atan2f(container.transform.b, container.transform.a);
CGFloat newVal = 0.0;
for (SMClove *c in cloves) {
if (c.minValue > 0 && c.maxValue < 0) { // anomalous case
if (c.maxValue > radians || c.minValue < radians) {
if (radians > 0) { // we are in the positive quadrant
newVal = radians - M_PI;
} else { // we are in the negative one
newVal = M_PI + radians;
}
currentValue = c.value;
}
}
else if (radians > c.minValue && radians < c.maxValue) {
newVal = radians - c.midValue;
currentValue = c.value;
}
}
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.2];
CGAffineTransform t = CGAffineTransformRotate(container.transform, -newVal);
container.transform = t;
[UIView commitAnimations];
[self.delegate wheelDidChangeValue:[self getCloveName:currentValue]];
UIImageView *im = [self getCloveByValue:currentValue];
im.alpha = maxAlphavalue;
}
- (NSString *) getCloveName:(int)position {
NSString *res = @"";
switch (position) {
case 0:
res = @"Circles";
break;
case 1:
res = @"Flower";
break;
case 2:
res = @"Monster";
break;
case 3:
res = @"Person";
break;
case 4:
res = @"Smile";
break;
case 5:
res = @"Sun";
break;
case 6:
res = @"Swirl";
break;
case 7:
res = @"3 circles";
break;
case 8:
res = @"Triangle";
break;
default:
break;
}
return res;
}
@end
principales métodos que le ayudarán a realizar el seguimiento del golpe son
- (float) calculateDistanceFromCenter:(CGPoint)point
- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
- (BOOL)continueTrackingWithTouch:(UITouch*)touch withEvent:(UIEvent*)event
- (void)endTrackingWithTouch:(UITouch*)touch withEvent:(UIEvent*)event
Que esto te ayude :)
