在iOS上增加手势锁屏、解锁功能

在一些涉及个人隐私的场景下，尤其是当移动设备包含太多私密信息时，为用户的安全考虑是有必要的。

桌面版的QQ在很多年前就考虑到用户离开电脑后隐私泄露的危险，提供了“离开电脑自动锁定”或者“闲置锁定”等类似功能，具体我也忘了。

而在iPhone版的QQ上，也提供了手势锁的功能。如下图：

我在上一篇博文中简单提到如何根据手指移动画线条，而这里是进一步的版本，仍然只是粗糙原型：

具体的代码实现如下：

[cpp] view plaincopy

//
// ViewController.m
// GestureLock
//
// Created by Jason Lee on 12-9-26.
// Copyright (c) 2012年 Jason Lee. All rights reserved.
//
#import "ViewController.h"
#define LOCK_POINT_TAG 1000
@interface ViewController ()
@property (nonatomic, strong) UIImageView *imageView;
@property (nonatomic, assign) CGPoint lineStartPoint;
@property (nonatomic, assign) CGPoint lineEndPoint;
@property (nonatomic, strong) NSMutableArray *buttonArray;
@property (nonatomic, strong) NSMutableArray *selectedButtons;
@property (nonatomic, assign) BOOL drawFlag;
@property (nonatomic, strong) UIImage *pointImage;
@property (nonatomic, strong) UIImage *selectedImage;
@end
@implementation ViewController
- (void)dealloc
{
[super dealloc];
//
[_imageView release];
[_buttonArray release];
[_selectedButtons release];
[_pointImage release];
[_selectedImage release];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:self.imageView];
self.imageView.backgroundColor = [UIColor whiteColor];
[self createLockPoints];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Trace Touch Point
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
if (touch) {
for (UIButton *btn in self.buttonArray) {
CGPoint touchPoint = [touch locationInView:btn];
if ([btn pointInside:touchPoint withEvent:nil]) {
self.lineStartPoint = btn.center;
self.drawFlag = YES;
if (!self.selectedButtons) {
self.selectedButtons = [NSMutableArray arrayWithCapacity:9];
}
[self.selectedButtons addObject:btn];
[btn setImage:self.selectedImage forState:UIControlStateNormal];
}
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
if (touch && self.drawFlag) {
self.lineEndPoint = [touch locationInView:self.imageView];
for (UIButton *btn in self.buttonArray) {
CGPoint touchPoint = [touch locationInView:btn];
if ([btn pointInside:touchPoint withEvent:nil]) {
BOOL btnContained = NO;
for (UIButton *selectedBtn in self.selectedButtons) {
if (btn == selectedBtn) {
btnContained = YES;
break;
}
}
if (!btnContained) {
[self.selectedButtons addObject:btn];
[btn setImage:self.selectedImage forState:UIControlStateNormal];
}
}
}
self.imageView.image = [self drawUnlockLine];
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[self outputSelectedButtons];
self.drawFlag = NO;
self.imageView.image = nil;
self.selectedButtons = nil;
}
#pragma mark - Create Lock Points
- (void)createLockPoints
{
self.pointImage = [UIImage imageNamed:@"blue_circle"];
self.selectedImage = [UIImage imageNamed:@"yellow_circle"];
float marginTop = 100;
float marginLeft = 45;
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.pointImage forState:UIControlStateNormal];
[btn setImage:self.selectedImage forState:UIControlStateHighlighted];
btn.frame = (CGRect){x+marginLeft, y+marginTop, self.pointImage.size};
[self.imageView addSubview:btn];
btn.userInteractionEnabled = NO;
btn.tag = LOCK_POINT_TAG + i * 3 + j;
if (!self.buttonArray) {
self.buttonArray = [NSMutableArray arrayWithCapacity:9];
}
[self.buttonArray addObject:btn];
}
}
}
#pragma mark - Draw Line
- (UIImage *)drawUnlockLine
{
UIImage *image = nil;
UIColor *color = [UIColor yellowColor];
CGFloat width = 5.0f;
CGSize imageContextSize = self.imageView.frame.size;
UIGraphicsBeginImageContext(imageContextSize);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, width);
CGContextSetStrokeColorWithColor(context, [color CGColor]);
CGContextMoveToPoint(context, self.lineStartPoint.x, self.lineStartPoint.y);
for (UIButton *selectedBtn in self.selectedButtons) {
CGPoint btnCenter = selectedBtn.center;
CGContextAddLineToPoint(context, btnCenter.x, btnCenter.y);
CGContextMoveToPoint(context, btnCenter.x, btnCenter.y);
}
CGContextAddLineToPoint(context, self.lineEndPoint.x, self.lineEndPoint.y);
CGContextStrokePath(context);
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
#pragma mark -
- (void)outputSelectedButtons
{
for (UIButton *btn in self.selectedButtons) {
[btn setImage:self.pointImage forState:UIControlStateNormal];
NSLog(@"Selected-button's tag : %d\n", btn.tag);
}
}
@end

Jason Lee @ Hangzhou

微博：@思禽饮霜

原文地址：http://blog.csdn.net/jasonblog/article/details/8024674

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