近期增加了object-c的具體應用，包括手勢繪制，驗證，更新，以及處理了一些手勢繪制過程中Bug。詳情見object-c實現。
- 一、swift實現
使用swift實現iOS手勢鎖屏，雖然在iOS客戶端很少使用到滑動手勢，但是有時候為了和安卓應用保持用戶交互的一致性，所以有的時候還是很有必要的。
iOS客戶端解鎖建議使用touch ID。
swift與object-c的CGContextRef不一樣，在swift中統一使用CGContext進行管理和使用。
本示例采用9*button進行繪制，關閉button交互事件，通過touchesBegan系列方法對滑動路徑進行跟蹤和繪制（imageView）。
以下為全部代碼：
import UIKit
class TouchPasswordViewController: UIViewController {
let screenWidth : CGFloat = UIScreen.main.bounds.size.width;
let screenHeight : CGFloat = UIScreen.main.bounds.size.height;
var btnArray : NSMutableArray = NSMutableArray.init(); //btn數組
var selectToArray : NSMutableArray = NSMutableArray.init();//選中的btn數組
var startPoint : CGPoint = CGPoint.init();//起點
var endPoint : CGPoint = CGPoint.init();//終點
var imageView : UIImageView = UIImageView.init();//繪制的背景
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor.white;
imageView = UIImageView.init(frame: CGRect.init(x: 0, y: 0, width: screenWidth, height: screenHeight));
self.view.addSubview(imageView);
for i in 0...2 {
for j in 0...2 {
let btn : UIButton = UIButton.init(type: UIButtonType.custom);
btn.frame = CGRect.init(x: screenWidth / 12 + screenWidth / 3 * CGFloat(j), y: screenHeight / 3 + screenWidth / 3 * CGFloat(i), width: screenWidth / 6, height: screenWidth / 6);
btn.setImage(UIImage.init(named: "尼羅河-4"), for: UIControlState.normal);
btn.setImage(UIImage.init(named: "尼羅河"), for: UIControlState.selected);
btn.isUserInteractionEnabled = false;//取消button的交互事件，否則touch會被截斷。
btnArray.add(btn);
imageView.addSubview(btn);
}
}
}
func drawLine() -> (UIImage){
var img : UIImage = UIImage.init();
let color : UIColor = UIColor.init(red: 1, green: 0, blue: 0, alpha: 1);
//繪制線條路徑
UIGraphicsBeginImageContext(imageView.frame.size);
let context = UIGraphicsGetCurrentContext();
context?.setLineWidth(5);
context?.setStrokeColor(color.cgColor);
context?.move(to: startPoint);
for b in selectToArray {
let btn : UIButton = b as! UIButton;
let btnPit = btn.center;
context?.addLine(to: btnPit);
context?.move(to: btnPit);
}
context?.addLine(to: endPoint);
context?.strokePath();
img = UIGraphicsGetImageFromCurrentImageContext()!;
UIGraphicsEndImageContext();
return img;
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch : UITouch = touches.first!;
for b in btnArray {
let btn : UIButton = b as! UIButton;
let btnPit : CGPoint = touch.location(in: btn);
if btn.point(inside: btnPit, with: nil) {//判斷當前touch是否btn范圍內，在則存入selectArray 并改變button狀態
selectToArray.add(btn);
btn.isHighlighted = true;
startPoint = btn.center;
}
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch : UITouch = touches.first!;
endPoint = touch.location(in: imageView);
for b in btnArray {
let btn : UIButton = b as! UIButton;
let po : CGPoint = touch.location(in: btn);
if btn.point(inside: po, with: nil) {
var isAdd : Bool = true;
for b in selectToArray {
let selectBtn : UIButton = b as! UIButton;
if selectBtn == btn {
isAdd = false;
break;
}
}
if isAdd {
selectToArray.add(btn);
btn.isHighlighted = true;
}
}
}
imageView.image = self.drawLine();
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
imageView.image = nil;
selectToArray.removeAllObjects();
for b in btnArray {
let btn : UIButton = b as! UIButton;
btn.isHighlighted = false;
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
- 二、object-c實現
object-c實現與swift邏輯一致，只是加入在實際使用過程中遇到的問題，使其更有參考性和實際應用價值。
注：代碼中有部分資源是中英文適配使用的。如：NSLocalizedString
在object-c中考慮到屏幕適配會導致button圖片拉伸，所以使用UIView代替UIButton。自定義了一個UIView.
1、RoundRectView.h
#import <UIKit/UIKit.h>
@interface RoundRectView : UIView
@property (nonatomic, strong) UIView *selectView;
@end
2、RoundRectView.m
#import "RoundRectView.h"
#import "SysConfig.h"
@interface RoundRectView ()
{
CGFloat _width;
}
@end
@implementation RoundRectView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
_width = frame.size.width / 4.0;
[self initUI];
}
return self;
}
- (void)initUI{
self.backgroundColor = [UIColor whiteColor];
self.layer.masksToBounds = YES;
self.layer.cornerRadius = self.frame.size.width/ 2.0;
self.layer.borderWidth = 2.0;
self.layer.borderColor = [UIColor hexString:@"#3fb8c8"].CGColor;
self.selectView = [[UIView alloc] initWithFrame:CGRectMake((self.frame.size.width - _width) / 2, (self.frame.size.width - _width) / 2, _width, _width)];
self.selectView.backgroundColor = [UIColor hexString:@"#3fb8c8"];
self.selectView.layer.masksToBounds = YES;
self.selectView.layer.cornerRadius = _width / 2.0;
self.selectView.hidden = YES;
[self addSubview:self.selectView];
}
@end
3、TouchUpViewController.h
#import <UIKit/UIKit.h>
#import "LXBaseViewController.h"
typedef enum : NSUInteger {
TouchUnlockCreatePwd,//繪制
TouchUnlockValidatePwd,//驗證
TouchUnlockUpdatePwd,//修改手勢
} UnlockType;
@interface TouchUpViewController : LXBaseViewController
- (instancetype)initWithUnlockType:(UnlockType)type;
@end
4、TouchUpViewController.m
#import "TouchUpViewController.h"
#import "RoundRectView.h"
#import "SysConfig.h"
#import "AppDelegate.h"
#import "LXNetworkRequest.h"
#import "LXNetworkRequest+LogWithEmail.h"
#define APPDELEGATEREAL (AppDelegate *)[UIApplication sharedApplication].delegate
#define TouchUnlockPwdKey @"touchUnlockPwdKey"
@interface TouchUpViewController ()
{
NSMutableArray *_nomarlArray,*_selectArray;
CGFloat _width,_height;
UIImageView *_imageView;
CGPoint _startPoint,_endPoint;
NSMutableString *_password;
NSString *_oldPassword;
UnlockType _unlockType;
NSInteger _errorCount;
UIImageView *_headerImageView;
UILabel *_nickNameLabel,*_tipLabel;
UIButton *_loginBtn;
BOOL isUpdatePwd;
NSInteger _steps;//1 驗證密碼 2：創建第一遍 3：創建第二遍
}
@end
@implementation TouchUpViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.title = NSLocalizedString(@"Draw Pattern", nil);
self.view.backgroundColor = [UIColor whiteColor];
[self initUI];
}
- (void)comeBack:(id)sender
{
[self.navigationController popViewControllerAnimated:YES];
}
- (instancetype)initWithUnlockType:(UnlockType)type{
self = [super init];
if (self) {
_unlockType = type;
}
return self;
}
- (void)initUI{
NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
NSString *savePwd = [def objectForKey:TouchUnlockPwdKey];
_width = [UIScreen mainScreen].bounds.size.width;
_height = [UIScreen mainScreen].bounds.size.height;
_password = [NSMutableString string];
_nomarlArray = [NSMutableArray array];
_selectArray = [NSMutableArray array];
_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, _width, _height)];
[self.view addSubview:_imageView];
CGFloat leftSpace = fitScreenWidth(40);
CGFloat wd = (_width - leftSpace * 2) /8.0;
NSInteger index = 1;
for (int i = 0; i < 3; i ++) {
for (int j = 0; j < 3; j ++) {
CGRect rect = CGRectMake(leftSpace + wd * 3 * j, _height / 3.0 + wd * 3 * i, wd * 2, wd * 2);
RoundRectView *ve = [[RoundRectView alloc] initWithFrame:rect];
ve.tag = index ++;
[_nomarlArray addObject:ve];
[_imageView addSubview:ve];
}
}
// - - - - - header - - - - - - - - -
_headerImageView = [[UIImageView alloc] initWithFrame:CGRectMake((_width - fitScreenWidth(50)) / 2, fitScreenWidth(60), fitScreenWidth(50), fitScreenWidth(50))];
_headerImageView.backgroundColor = [UIColor whiteColor];
[self.view addSubview:_headerImageView];
_nickNameLabel = [[UILabel alloc] initWithFrame:CGRectMake((_width - fitScreenWidth(100)) / 2, CGRectGetMaxY(_headerImageView.frame), fitScreenWidth(100), fitScreenWidth(25))];
_nickNameLabel.font = [UIFont systemFontOfSize:fitScreenWidth(12.0)];
_nickNameLabel.hidden = YES;
_nickNameLabel.textAlignment = NSTextAlignmentCenter;
[self.view addSubview:_nickNameLabel];
_tipLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, CGRectGetMaxY(_nickNameLabel.frame), _width - 20 * 2, fitScreenWidth(25))];
_tipLabel.font = [UIFont systemFontOfSize:fitScreenWidth(13.0)];
_tipLabel.textAlignment = NSTextAlignmentCenter;
_tipLabel.textColor = [UIColor lightGrayColor];
[self.view addSubview:_tipLabel];
_loginBtn = [[UIButton alloc] initWithFrame:CGRectMake((_width - fitScreenWidth(150)) / 2 , _height - fitScreenWidth(55), fitScreenWidth(150), 30)];
_loginBtn.titleLabel.font = [UIFont systemFontOfSize:fitScreenWidth(13.0)];
[_loginBtn setTitle:NSLocalizedString(@"Use login password", nil) forState:UIControlStateNormal];
[_loginBtn setTitleColor:[UIColor hexString:@"#3fb8c8"] forState:UIControlStateNormal];
[_loginBtn setHidden:YES];
[_loginBtn addTarget:self action:@selector(loginWithPwd) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_loginBtn];
UIBarButtonItem *resetBtn = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Reset", nil) style:UIBarButtonItemStylePlain target:self action:@selector(resetBtnClick)];
self.navigationItem.rightBarButtonItem = resetBtn;
if (_unlockType == TouchUnlockCreatePwd) {
//繪制
_steps = 2;
_tipLabel.text = NSLocalizedString(@"Draw Your Pattern", nil);
}
else if (_unlockType == TouchUnlockUpdatePwd){
//更新密碼不驗證原密碼 直接新增 !savePwd || savePwd.length == 0
_unlockType = TouchUnlockCreatePwd;
_tipLabel.text = NSLocalizedString(@"Draw new pattern", nil);
_steps = 2;
}
else if (_unlockType == TouchUnlockValidatePwd){
//驗證密碼
_steps = 1;
_errorCount = 5;
[_loginBtn setHidden:NO];
_tipLabel.text = NSLocalizedString(@"Draw Your Pattern", nil);
_headerImageView.layer.masksToBounds = YES;
_headerImageView.layer.cornerRadius = fitScreenWidth(50) / 2;
[_headerImageView setNewImageUrl:APPDELEGATE.userModel.avatar placeHolder:[UIImage imageNamed:@"login_content_Avatar@2x"]];
_nickNameLabel.hidden = NO;
_nickNameLabel.text = APPDELEGATE.userModel.nickname;
}
if ([savePwd isEqualToString:@"TouchPwdError"]) {
//密碼失效，直接彈出提示框
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self alertPwdError];
});
}
}
- (void)changeUI:(UnlockType)type{
//切換頭部視圖
}
- (void)changeTip:(NSInteger)index{
//改變警告文字 1:最少四個點，請重新繪制 2:與上次繪制不一致，請重新繪制 3：密碼錯誤還可以輸入5次
_tipLabel.textColor = [UIColor redColor];
NSString *text = nil;
switch (index) {
case 1:
{
text = NSLocalizedString(@"At least 4 points required", nil);
}
break;
case 2:
{
text = NSLocalizedString(@"Not match. Please draw it again", nil);
}
break;
case 3:
{
text = _errorCount == 10000 ? [NSString stringWithFormat:NSLocalizedString(@"Invalid password. Please draw it again", nil)] : [NSLocalizedString(@"Invalid password.*** attempt(s) left", nil) stringByReplacingOccurrencesOfString:@"***" withString:[NSString stringWithFormat:@"%ld",_errorCount -- > 0 ? _errorCount : 0]];
}
break;
default:
break;
}
_tipLabel.text = text;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
if (_unlockType == TouchUnlockCreatePwd) {
if (_steps == 2) {
[self changeTipForNormal:1];
}
else if (_steps == 3){
[self changeTipForNormal:3];
}
return;
}
[self changeTipForNormal:1];
});
}
- (void)changeTipForNormal:(NSInteger)index{
_tipLabel.textColor = [UIColor lightGrayColor];
NSString *text = @"";
switch (index) {
case 1:
text = NSLocalizedString(@"Draw Your Pattern", nil);
break;
case 2:
text = @"請輸入原手勢密碼";
break;
case 3:
text = NSLocalizedString(@"Draw pattern again", nil);
break;
case 4:
text = NSLocalizedString(@"Draw Your Pattern", nil);
break;
default:
break;
}
_tipLabel.text = text;
}
- (UIImage *)drawline{
if (_selectArray.count == 0) {
return nil;
}
RoundRectView *ve = _selectArray.firstObject;
CGPoint vePoint = ve.center;
_startPoint = vePoint;
UIImage *img = [[UIImage alloc] init];
UIColor *color = [UIColor hexString:@"#3fb8c8"];
UIGraphicsBeginImageContext(_imageView.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
// CGContextSetAllowsAntialiasing(context,true);
// CGContextSetShouldAntialias(context, true);
CGContextSetLineWidth(context, 2);
CGContextSetStrokeColorWithColor(context, color.CGColor);
CGContextMoveToPoint(context, _startPoint.x, _startPoint.y);
if (_selectArray.count == 0) {
return nil;
}
for (RoundRectView *ve in _selectArray) {
CGPoint po = ve.center;
CGContextAddLineToPoint(context, po.x, po.y);
CGContextMoveToPoint(context, po.x, po.y);
}
CGContextAddLineToPoint(context, _endPoint.x, _endPoint.y);
CGContextStrokePath(context);
img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
if (touch) {
for (RoundRectView *ve in _nomarlArray) {
CGPoint point = [touch locationInView:ve];
if ([ve pointInside:point withEvent:nil]) {
[_selectArray addObject:ve];
[self savePassWord:ve.tag];
ve.selectView.hidden = NO;
_startPoint = ve.center;
}
}
}
}
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
if (touch) {
_endPoint = [touch locationInView:_imageView];
for (RoundRectView *ve in _nomarlArray) {
CGPoint point = [touch locationInView:ve];
if ([ve pointInside:point withEvent:nil]) {
BOOL isAdd = YES;
for (RoundRectView *vv in _selectArray) {
if (vv == ve) {
isAdd = NO;
break;
}
}
if (isAdd) {
[_selectArray addObject:ve];
[self savePassWord:ve.tag];
ve.selectView.hidden = NO;
}
}
}
}
_imageView.image = [self drawline];
_imageView.layer.contentsScale = [[UIScreen mainScreen] scale];
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
if (touch) {
for (RoundRectView *ve in _nomarlArray) {
CGPoint po = [touch locationInView:ve];
if (![ve pointInside:po withEvent:nil]) {
RoundRectView *seVe = _selectArray.lastObject;
_endPoint = seVe.center;
_imageView.image = [self drawline];
}
}
}
[self cheakPassword];
_password = [NSMutableString string];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
_imageView.image = nil;
[_selectArray removeAllObjects];
for (RoundRectView *ve in _nomarlArray) {
ve.selectView.hidden = YES;
}
});
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (void)savePassWord:(NSInteger)tag{
[_password appendFormat:@"%ld",tag];
}
- (void)cheakPassword{
if (_password.length < 4) {
[self changeTip:1];
return; //密碼長度不夠
}
if (_unlockType == TouchUnlockCreatePwd) {
if (_steps == 2) {
_oldPassword = _password;
[self changeTipForNormal:3];
_steps = 3;
return;
}
if (_steps == 3) {
if (![_password isEqualToString:_oldPassword]) {
[self changeTip:2];
return; //前后不一致
}
if ([_oldPassword isEqualToString:_password]) {
//兩次密碼一致 存本地
NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
[def setObject:_password forKey:TouchUnlockPwdKey];
[MessageCenter openAlertViewWithMessage:NSLocalizedString(@"Success", nil) duringtime:1];
[self.navigationController popViewControllerAnimated:YES];
}
}
}
else if (_unlockType == TouchUnlockValidatePwd || _unlockType == TouchUnlockUpdatePwd){
//獲取保存的密碼
NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
NSString *savePwd = [def objectForKey:TouchUnlockPwdKey];
if (![savePwd isEqualToString:_password] && _steps == 1) {
//原密碼錯誤
_steps = 1;
[self changeTip:3];
if (_errorCount <= 0) {
//錯誤次數太多
[self alertPwdError];
return;
}
return;
}
//登陸成功
if (_unlockType == TouchUnlockValidatePwd) {
_errorCount = 5;
// [self dismissViewControllerAnimated:YES completion:nil];
if (![APPDELEGATEREAL lockScreenWindow].hidden) {
[APPDELEGATEREAL lockScreenWindow].hidden = YES;
}
return;
}
if (_steps == 1) {
[self changeTipForNormal:1];
_steps = 2;
return;
}
if (_steps == 2) {
_oldPassword = _password;
[self changeTipForNormal:3];
_steps = 3;
return;
}
if (_steps == 3) {
if (![_password isEqualToString:_oldPassword]) {
[self changeTip:2];
return;
}
if ([_oldPassword isEqualToString:_password]) {
//兩次密碼一致 存本地
NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
[def setObject:_password forKey:TouchUnlockPwdKey];
NSLog(@"密碼更新成功:%@",_password);
[MessageCenter openAlertViewWithMessage:NSLocalizedString(@"Success", nil) duringtime:1];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self.navigationController popViewControllerAnimated:YES];
});
}
}
}
}
- (void)alertPwdError{
//手勢密碼失效
[[NSUserDefaults standardUserDefaults] setObject:@"TouchPwdError" forKey:TouchUnlockPwdKey];
UIAlertController *alert = [UIAlertController alertControllerWithTitle:NSLocalizedString(@"Pattern is expired", nil) message:NSLocalizedString(@"Please login with password", nil) preferredStyle:UIAlertControllerStyleAlert];
NSMutableAttributedString *alertControllerMessageStr = [[NSMutableAttributedString alloc] initWithString:NSLocalizedString(@"Please login with password", nil)];
[alertControllerMessageStr addAttribute:NSForegroundColorAttributeName value:[UIColor hexString:@"#999999"] range:NSMakeRange(0, alertControllerMessageStr.length)];
[alertControllerMessageStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:12] range:NSMakeRange(0, alertControllerMessageStr.length)];
[alert setValue:alertControllerMessageStr forKey:@"attributedMessage"];
UIAlertAction *toAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"Login again", nil) style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self loginWithPwd];
}];
[alert addAction:toAction];
[self presentViewController:alert animated:YES completion:nil];
}
- (void)loginWithPwd{
LX_LoginAndForgetViewController *loginVc = [[LX_LoginAndForgetViewController alloc] init];
loginVc.isTouchUnlockIn = YES;
[self presentViewController:loginVc animated:YES completion:nil];
}
//重設
- (void)resetBtnClick{
_oldPassword = nil;
_steps = 2;
[self changeTipForNormal:1];
}
@end
5、AppDelegate中新增UIwindow屬性用于遮罩
//didFinishLaunchingWithOptions方法加入
self.lockScreenWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.lockScreenWindow.windowLevel= UIWindowLevelAlert+1;//最高級等級窗口
self.lockScreenWindow.backgroundColor = [UIColor whiteColor];
TouchUpViewController *lockvc =[[TouchUpViewController alloc]initWithUnlockType:TouchUnlockValidatePwd];
self.lockScreenWindow.rootViewController = lockvc;
self.lockScreenWindow.hidden = YES;
在合適的時候對lockScreenWindow.hidden屬性進行操作。
通過上述兩個類，初步建立了手勢密碼的邏輯體系。
