iOS 新手引导页面，透明遮罩指引页 —— HERO博客

首先看一下Demo效果图：

这种遮罩通常作为新手引导页面。通常有镂空的一部分，附有描述，指引用户第一次进入界面该如何操作，只显示一次。

下面给出两种实现思路：

第一种：UI切好整张图片，直接显示到UIWindow上，不推荐使用该方法。

优点：程序实现简单，便捷。

缺点：适配不同机型需要多套图片（Android内心是崩溃的），后期迭代界面改动则要更新图片，UI工作量庞大。

第二种：Demo使用的方法，自己实现一个UIView，通过设置其layer的mask属性来实现镂空区域。

优点：UI只提供描述的图片即可，减少应用大小，灵活适配不同机型。

缺点：代码较第一种略多，后期迭代界面改动要更新控件frame。

下面贴上核心代码：

控制器，ViewController：

#import "ViewController.h"
#import "HWGuidePageManager.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];
    
    // 创建控件
    [self creatControl];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    
    // 引导视图
    [self showGuidePage];
}

- (void)creatControl
{
    // 底图
    UIImageView *imgView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    imgView.image = [UIImage imageNamed:@"backImg"];
    imgView.contentMode = UIViewContentModeScaleAspectFill;
    [self.view addSubview:imgView];
}

- (void)showGuidePage
{
    // 判断是否已显示过
    if (![[NSUserDefaults standardUserDefaults] boolForKey:HWGuidePageHomeKey]) {
        // 显示
        [[HWGuidePageManager shareManager] showGuidePageWithType:HWGuidePageTypeHome completion:^{
            [[HWGuidePageManager shareManager] showGuidePageWithType:HWGuidePageTypeMajor];
        }];
    }
}

@end

封装的指引页管理类，HWGuidePageManager.h：

#import 

typedef void(^FinishBlock)(void);

typedef NS_ENUM(NSInteger, HWGuidePageType) {
    HWGuidePageTypeHome = 0,
    HWGuidePageTypeMajor,
};

@interface HWGuidePageManager : NSObject

// 获取单例
+ (instancetype)shareManager;

/**
 显示方法

 @param type 指引页类型
 */
- (void)showGuidePageWithType:(HWGuidePageType)type;

/**
 显示方法

 @param type 指引页类型
 @param completion 完成时回调
 */
- (void)showGuidePageWithType:(HWGuidePageType)type completion:(FinishBlock)completion;

@end

HWGuidePageManager.m：

#import "HWGuidePageManager.h"

@interface HWGuidePageManager ()

@property (nonatomic, copy) FinishBlock finish;
@property (nonatomic, copy) NSString *guidePageKey;
@property (nonatomic, assign) HWGuidePageType guidePageType;

@end

@implementation HWGuidePageManager

+ (instancetype)shareManager
{
    static HWGuidePageManager *instance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [[self alloc] init];
    });
    
    return instance;
}

- (void)showGuidePageWithType:(HWGuidePageType)type
{
    [self creatControlWithType:type completion:NULL];
}

- (void)showGuidePageWithType:(HWGuidePageType)type completion:(FinishBlock)completion
{
    [self creatControlWithType:type completion:completion];
}

- (void)creatControlWithType:(HWGuidePageType)type completion:(FinishBlock)completion
{
    _finish = completion;

    // 遮盖视图
    CGRect frame = [UIScreen mainScreen].bounds;
    UIView *bgView = [[UIView alloc] initWithFrame:frame];
    bgView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.7f];
    [bgView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)]];
    [[UIApplication sharedApplication].keyWindow addSubview:bgView];
    
    // 信息提示视图
    UIImageView *imgView = [[UIImageView alloc] init];
    [bgView addSubview:imgView];
    
    // 第一个路径
    UIBezierPath *path = [UIBezierPath bezierPathWithRect:frame];
    switch (type) {
        case HWGuidePageTypeHome:
            // 下一个路径，圆形
            [path appendPath:[UIBezierPath bezierPathWithArcCenter:KSuitPoint(227, 188) radius:KSuitFloat(46) startAngle:0 endAngle:2 * M_PI clockwise:NO]];
            imgView.frame = KSuitRect(220, 40, 100, 100);
            imgView.image = [UIImage imageNamed:@"hi"];
            _guidePageKey = HWGuidePageHomeKey;
            break;
            
        case HWGuidePageTypeMajor:
            // 下一个路径，矩形
            [path appendPath:[[UIBezierPath bezierPathWithRoundedRect:KSuitRect(5, 436, 90, 40) cornerRadius:5] bezierPathByReversingPath]];
            imgView.frame = KSuitRect(100, 320, 120, 120);
            imgView.image = [UIImage imageNamed:@"ly"];
            _guidePageKey = HWGuidePageMajorKey;
            break;
            
        default:
            break;
    }
    
    // 绘制透明区域
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.path = path.CGPath;
    [bgView.layer setMask:shapeLayer];
}

- (void)tap:(UITapGestureRecognizer *)recognizer
{
    UIView *bgView = recognizer.view;
    [bgView removeFromSuperview];
    [bgView removeGestureRecognizer:recognizer];
    [[bgView subviews] makeObjectsPerformSelector:@selector(removeFromSuperview)];
    bgView = nil;
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:_guidePageKey];
    
    if (_finish) _finish();
}

@end

Demo下载链接：http://code.cocoachina.com/view/137011。

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