[iOS]划屏解锁（重写UIView）

#import <UIKit/UIKit.h>@interface PaddleDraw : UIView <UIAlertViewDelegate >
@property (strong, nonatomic) NSMutableArray  *pointAdd;     // 存储被触摸到的button的中心点
@property (strong, nonatomic) NSMutableArray  *centerPoint;  // 存储初始化创建的Button中心点
@property (strong, nonatomic) NSMutableArray  *buttonArr;    // 存储所有Button
@property (strong, nonatomic) NSMutableString *strScore;     // 第一次设置密码，按触摸顺序
@property (strong, nonatomic) NSMutableString *compareScore; // 第二次输入密码
@property (strong, nonatomic) UIView *topView;               // 透明玻璃纸// 还原Button状态
- (void)cleanButton;@end#import "PaddleDraw.h"@implementation PaddleDraw
@synthesize pointAdd = _pointAdd;
@synthesize centerPoint = _centerPoint;
@synthesize buttonArr = _buttonArr;
@synthesize strScore = _strScore;
@synthesize compareScore = _compareScore;
@synthesize topView = _topView;- (id)initWithFrame:(CGRect)frame {self = [super initWithFrame:frame];if (self) {// Initialization code}return self;
}// 自己写一个构造函数，按照上面函数的格式
- (id)initWithCoder:(NSCoder *)aDecoder {self = [super initWithCoder:aDecoder];if (self) {// 存储Button中心点_centerPoint = nil;if (!_centerPoint) {_centerPoint = [[NSMutableArray alloc] init];}[_centerPoint removeAllObjects];// 存储所有Button_buttonArr = nil;if (!_buttonArr) {_buttonArr = [[NSMutableArray alloc ] init];}// 定义Button格数for (int i = 0 ; i < 20 ; i ++) {UIButton *screenButton = [[UIButton alloc] init];[screenButton setFrame:CGRectMake(5+(i%4)*87.6, 100+(i/4)*87.6, 32, 32)];[screenButton setBackgroundImage:[UIImage imageNamed:@"gray.png"] forState:UIControlStateNormal];[screenButton setTag:i+1];CGPoint pointBut = [screenButton center];[_centerPoint addObject:[NSValue valueWithCGPoint:pointBut]];[_buttonArr addObject:screenButton];[self addSubview:screenButton];}// 放一个透明的View接受响应，避免Button吸收响应if (!_topView) {_topView = [[UIView alloc] initWithFrame:CGRectMake(0, 20, 320, 568)];[_topView setBackgroundColor:[UIColor clearColor] ];[self addSubview:_topView];}}  return self;  
}// Only override drawRect: if you perform custom drawing.
- (void)drawRect:(CGRect)rect {// Drawing codeif(_pointAdd){CGContextRef context = UIGraphicsGetCurrentContext();CGPoint startPoint = [[_pointAdd firstObject] CGPointValue];CGContextMoveToPoint(context, startPoint.x, startPoint.y);for(int j = 0;j < [_pointAdd count];j ++){CGPoint tempArr = [[_pointAdd objectAtIndex:j] CGPointValue];CGContextAddLineToPoint(context, tempArr.x,tempArr.y);}[[UIColor colorWithRed:250/255.0 green:200/255.0 blue:99/255.0 alpha:1] set];CGContextSetLineWidth(context, 10);CGContextStrokePath(context);}
}// 还原Button状态
- (void)cleanButton {for (UIButton *tempBut in _buttonArr) {[tempBut setBackgroundImage:[UIImage imageNamed:@"gray.png"] forState:UIControlStateNormal ];}// 密码清空_strScore = nil;// 刷新，重新显示[self setNeedsDisplay];
}#pragma mark UIResponder
// 开始触摸
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {// 还原Button的状态[self cleanButton];
}// 触摸移动，不断监听一次有效的Touch移动
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {CGPoint point = [[touches anyObject] locationInView:self];if (!_pointAdd) {   // 触摸经过的Button中心_pointAdd = [[NSMutableArray alloc] init];}if (!_strScore) {    // 密码_strScore = [[NSMutableString alloc] init];}// 判断触摸在UI上的点，是否在Button上，for (int i = 0 ; i < 5 ; i ++) {if (point.y > 100+(i%5)*87.6 && point.y < 100+(i%5)*87.6+32) {for (int j = 0 ; j < 4 ; j ++) {if (point.x > 10+(j%4)*87.6 && point.x < 10+(j%4)*87.6+32) {// 取得该Button的中心点坐标,传给PointAddNSMutableArray *aaa = _centerPoint;NSLog(@"___%@",aaa);[_pointAdd addObject:[_centerPoint objectAtIndex:4*i+j]];// 存储密码，Button连接顺序NSString *strTemp = [NSString stringWithFormat:@"%d",4*i+(j+1)];NSRange range = [_strScore rangeOfString:strTemp];   // 查看当前Button是否已经经过一次，if (range.location == NSNotFound) {[_strScore appendString:strTemp];}// 取得Button，改变其状态UIButton *theButton = (UIButton *)[self viewWithTag:4*i+j+1];[theButton setBackgroundImage:[UIImage imageNamed:@"yellow.png"] forState:UIControlStateNormal];// 改变状态后，跳出for循环break;}}break;}}[self setNeedsDisplay];
}// 触摸事件完成
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {// 触摸结束后，清空上次触摸存储到pointAdd中的Button中心坐标数据[_pointAdd removeAllObjects];// 查看密码,比较第二次输入密码是否相同if (!_compareScore) {_compareScore = [[NSMutableString alloc] init];}if (![_strScore isEqualToString:_compareScore]) {UIAlertView *theAlert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"验证密码" delegate:self cancelButtonTitle:@"再次输入" otherButtonTitles:@"取消", nil, nil];[theAlert show];} else {// 成功设置，页面跳转UIAlertView *theAlert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"验证成功" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil, nil];[theAlert show];}
}// 触摸事件取消，比如来电话打断
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {NSLog(@"touchesCancelled");
}#pragma mark UIAlertViewDelegate
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex{// 再次输入if (buttonIndex == 0) {// 查看密码,比较第二次输入密码是否相同_compareScore = _strScore;[self cleanButton];}// 重新输入if (buttonIndex == 1) {[self cleanButton];}  
}@end