本文主要是介绍分享一个类似QQ屏保解锁的代码类，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
话不多说了，直接上代码：.h文件
//
// GestureCodeViewController.h
// DailyRecord
//
// Created by sven on 13-6-20.
// Copyright (c) 2013年 sven. All rights reserved.
//#import <UIKit/UIKit.h>#define LOCK_POINT_TAG 1000
@interface GestureCodeViewController : UIViewController
{UIImageView *m_imageView;CGPoint m_lineStartPoint;CGPoint m_lineEndPoint;NSMutableArray *m_mutArrButtons;NSMutableArray *m_mutArrSelectedButtons;BOOL m_drawFlag;UIImage *m_pointImage;UIImage *m_selectedImage;
}@property (retain, nonatomic) UIImageView *m_imageView;@property (assign, nonatomic) CGPoint m_lineStartPoint;
@property (assign, nonatomic) CGPoint m_lineEndPoint;@property (retain, nonatomic) NSMutableArray *m_mutArrButtons;
@property (retain, nonatomic) NSMutableArray *m_mutArrSelectedButtons;@property (assign, nonatomic) BOOL m_drawFlag;@property (retain, nonatomic) UIImage *m_pointImage;
@property (retain, nonatomic) UIImage *m_selectedImage;@end
.m文件
//
// GestureCodeViewController.m
// DailyRecord
//
// Created by sven on 13-6-20.
// Copyright (c) 2013年 sven. All rights reserved.
//#import "GestureCodeViewController.h"@interface GestureCodeViewController ()@end@implementation GestureCodeViewController@synthesize m_imageView;
@synthesize m_lineStartPoint;
@synthesize m_lineEndPoint;
@synthesize m_drawFlag;
@synthesize m_mutArrButtons;
@synthesize m_mutArrSelectedButtons;
@synthesize m_pointImage;
@synthesize m_selectedImage;#pragma mark -life cycle- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];if (self) {// Custom initialization}return self;
}- (void)viewDidLoad
{[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];imageView.backgroundColor = [UIColor whiteColor];self.m_imageView = imageView;[imageView release];[self.view addSubview:m_imageView];[self createLockPoints];
}- (void)didReceiveMemoryWarning
{[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}- (void)dealloc
{[m_imageView release], m_imageView = nil;[m_mutArrButtons release], m_mutArrButtons = nil;[m_mutArrSelectedButtons release], m_mutArrSelectedButtons = nil;[m_pointImage release], m_pointImage = nil;[m_selectedImage release], m_selectedImage = nil;[super dealloc];
}#pragma mark - Trace Touch Point- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{UITouch *touch = [touches anyObject];if (touch){for (UIButton *btn in self.m_mutArrButtons){CGPoint touchPoint = [touch locationInView:btn];if ([btn pointInside:touchPoint withEvent:nil]){self.m_lineStartPoint = btn.center;self.m_drawFlag = YES;if (!self.m_mutArrSelectedButtons){self.m_mutArrSelectedButtons = [NSMutableArray arrayWithCapacity:9];}[self.m_mutArrSelectedButtons addObject:btn];[btn setImage:self.m_selectedImage forState:UIControlStateNormal];}}}
}- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{UITouch *touch = [touches anyObject];if (touch && self.m_drawFlag){self.m_lineEndPoint = [touch locationInView:self.m_imageView];for (UIButton *btn in self.m_mutArrButtons){CGPoint touchPoint = [touch locationInView:btn];if ([btn pointInside:touchPoint withEvent:nil]){BOOL btnContained = NO;for (UIButton *selectedBtn in self.m_mutArrSelectedButtons){if (btn == selectedBtn){btnContained = YES;break;}}if (!btnContained){[self.m_mutArrSelectedButtons addObject:btn];[btn setImage:self.m_selectedImage forState:UIControlStateNormal];}}}self.m_imageView.image = [self drawUnlockLine];}
}- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{[self outputSelectedButtons];self.m_drawFlag = NO;self.m_imageView.image = nil;self.m_mutArrSelectedButtons = nil;
}- (void)createLockPoints
{self.m_pointImage = [UIImage imageNamed:@"blue_circle"];self.m_selectedImage = [UIImage imageNamed:@"yellow_circle"];float marginTop = 150;float marginLeft = 40;float y;for (int i = 0; i < 3; ++i){y = i * 100;float x;for (int j = 0; j < 3; ++j){x = j * 100;UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];[btn setImage:self.m_pointImage forState:UIControlStateNormal];[btn setImage:self.m_selectedImage forState:UIControlStateHighlighted];btn.frame = (CGRect){x+marginLeft, y+marginTop, self.m_pointImage.size};[self.m_imageView addSubview:btn];btn.userInteractionEnabled = NO;btn.tag = LOCK_POINT_TAG + i * 3 + j;if (!self.m_mutArrButtons) {self.m_mutArrButtons = [NSMutableArray arrayWithCapacity:9];}[self.m_mutArrButtons addObject:btn];}}
}#pragma mark - Draw Line- (UIImage *)drawUnlockLine
{UIImage *image = nil;UIColor *color = [UIColor yellowColor];CGFloat width = 5.0f;CGSize imageContextSize = self.m_imageView.frame.size;UIGraphicsBeginImageContext(imageContextSize);CGContextRef context = UIGraphicsGetCurrentContext();CGContextSetLineWidth(context, width);CGContextSetStrokeColorWithColor(context, [color CGColor]);CGContextMoveToPoint(context, self.m_lineStartPoint.x, self.m_lineStartPoint.y);for (UIButton *selectedBtn in self.m_mutArrSelectedButtons){CGPoint btnCenter = selectedBtn.center;CGContextAddLineToPoint(context, btnCenter.x, btnCenter.y);CGContextMoveToPoint(context, btnCenter.x, btnCenter.y);}CGContextAddLineToPoint(context, self.m_lineEndPoint.x, self.m_lineEndPoint.y);CGContextStrokePath(context);image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image;
}#pragma mark -- (void)outputSelectedButtons
{for (UIButton *btn in self.m_mutArrSelectedButtons){[btn setImage:self.m_pointImage forState:UIControlStateNormal];NSLog(@"Selected-button's tag : %d\n", btn.tag);}}@end是不是很好用呢！
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