IOS 手势解锁

Question

http://code4app.com/ios/Pattern-Lock-App/4f9795e506f6e7f068000000

Answer 1

分享一下code，写的不是很优美，不过能用 @interface SettingViewController () {
}
@property (strong) UIImageView *backView;
@property (strong) NSMutableArray *pointArr;
@property (strong) NSMutableArray *keyArr;
@property (strong) NSString *rightKeyString;
@end@implementation SettingViewController- (id)init
{
    self = [super init];
    if (self) {
_pointArr = [[NSMutableArray alloc]initWithCapacity:9];
_keyArr = [[NSMutableArray alloc]initWithCapacity:9];
_rightKeyString = @"14678";
    }
    return self;
}-(BOOL)shouldAutomaticallyForwardRotationMethods
{
    return NO;
}- (void)loadView
{
    [super loadView];
    CGRect bounds = [[UIScreen mainScreen] applicationFrame];
    bounds = bounds;

    //View
    //self.view = [[UIView alloc] initWithFrame:bounds];
    self.view.backgroundColor = [UIColor colorWithRed:200.0/255.0 green:200.0/255.0 blue:200.0/255.0 alpha:1];
    
//back
_backView=[[UIImageView alloc] initWithFrame:self.view.frame];
    [self.view addSubview:_backView]; //other
float begin_x = bounds.size.width/4;
float begin_y = bounds.size.height/4;
float inteval = bounds.size.width/4;

float point_radius = bounds.size.width/16;


for(int iY=0;iY<3;iY++)
{
for(int iX=0;iX<3;iX++)
{
UIImageView *img = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,point_radius*2, point_radius*2)];
[img setCenter:CGPointMake(begin_x+inteval*iX , begin_y+inteval*iY)];
[_pointArr addObject:img];
[self.view addSubview:img];
}
}
}-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"touches Began");
[_keyArr removeAllObjects];
//CGPoint startPoint = [self getCurrentPoint:touches];
}-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{

CGPoint movePoint = [self getCurrentPoint:touches];
NSUInteger indexTouched = [self touchPoint2Index:movePoint];

if(indexTouched!=-1)
{
[self addtoKeyArr:indexTouched];
}

//DrawLines and change png
[self drawUI];

}-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
if(_keyArr.count<1)
return;

CGPoint endPoint = [self getCurrentPoint:touches];
NSLog(@"x:%f ;  y:%f",endPoint.x,endPoint.y);

NSString *strKeyInput = @"";
for(int i=0;i<_keyArr.count;i++)
{
strKeyInput = [strKeyInput stringByAppendingString:[_keyArr objectAtIndex:i]];
}
if([strKeyInput isEqual:_rightKeyString])
{
[GeneralFunction.inst AlertTemporayString:@"Success" tick:0.5f];
}
else
{
[GeneralFunction.inst AlertString:@"Fail,Please Retry"];
}
[self ClearKeyScreen];}-(CGPoint)getCurrentPoint:(NSSet*)touches
{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:touch.view];
return point;
}-(void)addtoKeyArr:(NSUInteger)val
{
NSString *str = [NSString stringWithFormat:@"%d",val];
if(![_keyArr containsObject:str])
{
[_keyArr addObject:str];
}

//test
NSString *strKey = @"";
for(int i=0;i<_keyArr.count;i++)
{
strKey = [strKey stringByAppendingString:[_keyArr objectAtIndex:i]];
}
NSLog(@"%@",strKey);
}-(NSUInteger)touchPoint2Index:(CGPoint)movePoint
{
for(int i=0;i<_pointArr.count;i++)
{

UIImageView *img = [_pointArr objectAtIndex:i];
CGRect r = img.frame;
if(r.origin.x < movePoint.x &&
   r.origin.y < movePoint.y &&
   r.size.width+r.origin.x > movePoint.x &&
   r.size.height+r.origin.y > movePoint.y
   )
{
return i;
}
}
return -1;
}-(void)drawUI
{
//change png
for(int i=0;i<_keyArr.count;i++)
{
NSString *strKey = [_keyArr objectAtIndex:i];
int iKey = strKey.intValue;

UIImageView *imgView = [_pointArr objectAtIndex:iKey];
[imgView setImage:[UIImage imageNamed:@"point_2.png"]];
}

//draw lines
if(_keyArr.count>1)
{
UIGraphicsBeginImageContext(_backView.frame.size);
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 4.0);  //线宽
CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(), YES);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.0, 1.0, 1.0);  //颜色
CGContextBeginPath(UIGraphicsGetCurrentContext());// CGContextClearRect(UIGraphicsGetCurrentContext(), _backView.frame); for(int i=0;i<_keyArr.count-1;i++)
{
NSString *strKey1 = [_keyArr objectAtIndex:i];
int iKey1 = strKey1.intValue;
UIImageView *imgView1 = [_pointArr objectAtIndex:iKey1];
CGFloat x1 = imgView1.center.x;
CGFloat y1 = imgView1.center.y;

NSString *strKey2 = [_keyArr objectAtIndex:i+1];
int iKey2 = strKey2.intValue;
UIImageView *imgView2 = [_pointArr objectAtIndex:iKey2];
CGFloat x2 = imgView2.center.x;
CGFloat y2 = imgView2.center.y;

CGContextMoveToPoint(UIGraphicsGetCurrentContext(), x1, y1);  //起点坐标
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), x2, y2);   //终点坐标
CGContextStrokePath(UIGraphicsGetCurrentContext());
}
_backView.image=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
}-(void)ClearKeyScreen
{
//Reset Point
for(NSUInteger i=0;i<_pointArr.count;i++)
{
UIImageView *imgEle = [_pointArr objectAtIndex:i];
[imgEle setImage:[UIImage imageNamed:@"point_1.png"]];
}


//Clear Screen
UIGraphicsBeginImageContext(_backView.frame.size);
CGContextClearRect(UIGraphicsGetCurrentContext(), _backView.frame);
_backView.image=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

}
- (void)viewDidLoad
{
    [super viewDidLoad];
}- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

[self ClearKeyScreen];

}
@end