自定义实现代理(Delegate)，注意在代理实现类中设置delegate

今天实现一个类似Android上的解锁的效果(UnlockView)，用到了代理(解锁成功后需要在ViewController中切换界面)。

代码如下：

ZYBUnlockView.h

#import <UIKit/UIKit.h>

@protocol ZYBUnlockViewDelegate;@interface  ZYBUnlockView : UIView

@property (nonatomic, retain) id<ZYBUnlockViewDelegate> delegate;

//  用户输入的密码串
@property (strong, nonatomic) NSMutableArray *passwordArray;
//  存储解锁View中的图片Rect
@property (strong, nonatomic) NSMutableArray *lockImageRectArray;@end 

@protocol ZYBUnlockViewDelegate
- (void)passwordIsCorrected;@end

ZYBUnlockView.m

#import "ZYBUnlockView.h"


@interface ZYBUnlockView (PrivateMethods)
//  初始化解锁界面
- (void)initUnlockView;


//  将用户触摸过的图片的位置点保存到数组中
- (void)addNodeToPasswordArray:(int)node;
@end

@implementation ZYBUnlockView

@synthesize delegate;
@synthesize passwordArray;
@synthesize lockImageRectArray;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor whiteColor];
    }
    return self;
}

//  初始化解锁界面
- (void)initUnlockView
{
    if (self.lockImageRectArray) {
        [self.lockImageRectArray removeAllObjects];
    }
    
    if (self.lockImageRectArray == nil) {
        self.lockImageRectArray = [[NSMutableArray alloc] init];
    }
    
    for (int r = 0; r < 3; r++) {
        for (int l = 0; l < 3; l++) {
            UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"lockButton.png"]];
            imageView.frame = CGRectMake((30.0f + imageView.frame.size.width) * l, (30.0f + imageView.frame.size.height) * r, imageView.frame.size.width, imageView.frame.size.height);
            
            //  存储每个图片的Rect信息
            [self.lockImageRectArray addObject:[NSValue valueWithCGRect:imageView.frame]];
            
            [self addSubview:imageView];
        }
    }
}

// 绘制解锁View
- (void)drawRect:(CGRect)rect
{
    [self initUnlockView];
}

- (void)addNodeToPasswordArray:(int)node
{
    NSNumber *currentNumber = [NSNumber numberWithInt:node];
    
    for (NSNumber *number in self.passwordArray) {
        if ([number isEqualToNumber:currentNumber]) {
            return;
        }
    }

    [self.passwordArray addObject:currentNumber];
}

//  自定义Touch事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (self.passwordArray == nil) {
        self.passwordArray = [[NSMutableArray alloc] init];
    } else {
        [self.passwordArray removeAllObjects];
    }
    
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:touch.view];
    
    for (int r = 0; r < 3; r++) {
        for (int l = 0; l < 3; l++) {
            if (CGRectContainsPoint([[self.lockImageRectArray objectAtIndex:r * 3 + l] CGRectValue], location)) {
                UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"unlockButton.png"]];
                imageView.frame = CGRectMake((30.0f + imageView.frame.size.width) * l, (30.0f + imageView.frame.size.height) * r, imageView.frame.size.width, imageView.frame.size.height);
                
                [self addNodeToPasswordArray:r * 3 + l];
                
                [self addSubview:imageView];
            }
        }
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:touch.view];
    
    for (int r = 0; r < 3; r++) {
        for (int l = 0; l < 3; l++) {
            if (CGRectContainsPoint([[self.lockImageRectArray objectAtIndex:r * 3 + l] CGRectValue], location)) {
                UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"unlockButton.png"]];
                imageView.frame = CGRectMake((30.0f + imageView.frame.size.width) * l, (30.0f + imageView.frame.size.height) * r, imageView.frame.size.width, imageView.frame.size.height);
                
                [self addNodeToPasswordArray:r * 3 + l];
                
                [self addSubview:imageView];
            }
        }
    }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
    NSMutableArray *basicPassword = [userDefault objectForKey:@"basicPassword"];
    if (basicPassword == nil) {
        [userDefault setObject:self.passwordArray forKey:@"basicPassword"];
    } else {
        
        //NSLog(@"%@,%@", basicPassword, self.passwordArray);
        
        if ([basicPassword isEqual:self.passwordArray]) {
            [self.delegate passwordIsCorrected];
        }
    }
    
    [self initUnlockView];
}


@end

上面的ZYBUnlockView类，实现了一个解锁View。当解锁成功后需要从解锁界面(ZYBStartupViewController)调转到其他界面(ZYBMainViewController)，判断是否解锁成功的逻辑在ZYBUnlockView中( - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event)，但是ZYBUnlockView或UIView类不能直接实现视图控制器(UIViewController)的转换。使用代理，在UIViewController类中实现ZYBUnlockView中声明的代理方法，就可以解决这个问题，如下：

ZYBStartupViewController.h

#import <UIKit/UIKit.h>
#import "ZYBUnlockView.h"@interface  ZYBStartupViewController : UIViewController <ZYBUnlockViewDelegate>

@property (nonatomic, strong) ZYBUnlockView *unlockView;@end

ZYBStartupViewController.m

#import "ZYBStartupViewController.h"
#import "ZYBPasswordListViewController.h"

@implementation ZYBStartupViewController

@synthesize unlockView;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.unlockView = [[ZYBUnlockView alloc] initWithFrame:CGRectMake(40.0f, 140.0f, self.view.bounds.size.width - 40.0f, self.view.bounds.size.height/2)];
    self.unlockView.delegate = self;
    [self.view insertSubview:self.unlockView atIndex:0];
    
    self.view.backgroundColor = [UIColor whiteColor];
}


- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - ZYBUnlockViewDelegate
- (void)passwordIsCorrected
{
    ZYBPasswordListViewController *passwordListViewController = [[ZYBPasswordListViewController alloc] init];
    NSLog(@"sdsd");
    [self.navigationController pushViewController:passwordListViewController animated:YES];
}@end

在方法ViewDidLoad中注意设置代理的值（ self.unlockView.delegate = self;），否则代理方法无法被调用。

转载于:https://my.oschina.net/yongbin45/blog/63894