需求

来源：互联网发布：义乌样品淘宝拍摄编辑：程序博客网时间：2024/04/26 02:54

上面提到一个朦胧遮罩的实现方式

接下来介绍另外一种实现，利用iOS7所提供的 UIVisualEffectView 来实现（自行百度一下这个类的介绍）

并且前提先要了解清楚：

- (nullable UIView *)hitTest:(CGPoint)point withEvent:(nullable UIEvent *)event;

hitTest这个方法结合UIWindow，经常来配合使用，比较多的场景有置顶操作，朦胧遮罩层的实现等等

最重要的功能是这个方法可以穿透视图层，这样你可以锁定你要响应的对象，这里记住这个话，以后大大有所用

一、定义UIWindow类，作为响应罩面：

#import <UIKit/UIKit.h>@interface OverheadView : UIWindow@end

实现：

#import "OverheadView.h"@implementation OverheadView- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{    id obj = [super hitTest:point withEvent:event];    if ([obj isKindOfClass:NSClassFromString(@"HyRoundMenuView")]) {        return obj;    }    return nil;}@end

稍微解释一下：出现朦胧遮罩面时候，返回obj响应对象，否则，穿透该window层级（无视它）

二、定义遮罩层视图

#import <UIKit/UIKit.h>#import "HyRoundMenuModel.h"typedef enum : NSUInteger{    HyRoundMenuViewBackgroundViewTypeBlur NS_ENUM_AVAILABLE_IOS(9_0) = 0,    HyRoundMenuViewBackgroundViewTypeCustomColors = 1,}   HyRoundMenuViewBackgroundViewType;@interface HyRoundMenuView : UIControl@property (nonatomic, assign) UIBlurEffectStyle blurEffectStyle;@property (nonatomic, nonnull, copy  ) UIColor *customBackgroundViewColor;@property (nonatomic, assign) HyRoundMenuViewBackgroundViewType backgroundViewType;+ (__nonnull instancetype) shareInstance;@end

实现：

#import "HyRoundMenuView.h"#import "OverheadView.h"#define IH_DEVICE_HEIGHT    [[UIScreen mainScreen] bounds].size.height#define IH_DEVICE_WIDTH     [[UIScreen mainScreen] bounds].size.width@interface HyRoundMenuView ()@property (nonatomic, nonnull, strong) UIView *backgroundView;@property (nonatomic, nonnull, strong) OverheadView *topView;@end@implementation HyRoundMenuViewstatic HyRoundMenuView* _instance = nil;     +(instancetype) shareInstance{    static dispatch_once_t onceToken ;    dispatch_once(&onceToken, ^{        _instance = [[super allocWithZone:NULL] init] ;    }) ;    return _instance ;}- (instancetype) init{    self = [super init];        if (self) { [self initUI]; }        return self;}- (void)initUI{    self.frame = [UIScreen mainScreen].bounds;    self.backgroundColor = [UIColor clearColor];    self.userInteractionEnabled = true;        _blurEffectStyle    = UIBlurEffectStyleLight;    _backgroundViewType = HyRoundMenuViewBackgroundViewTypeBlur;        //backgroundView    if (!_backgroundView) {        _backgroundView = [[UIVisualEffectView alloc] initWithFrame:[UIScreen mainScreen].bounds];        _backgroundView.hidden = YES;        _backgroundView.backgroundColor = [UIColor clearColor];        ((UIVisualEffectView *)_backgroundView).effect = nil;    }    [_backgroundView setFrame:self.bounds];        [self addSuperView];}- (void)addSuperView{    _topView = [[OverheadView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    _topView.backgroundColor = [UIColor colorWithWhite:1 alpha:0];    _topView.windowLevel = UIWindowLevelAlert;    _topView.hidden = NO;    _topView.alpha = 1;    [_topView makeKeyAndVisible];    UIViewController *vc = [UIViewController new];    _topView.rootViewController = vc;    [_topView addSubview:_backgroundView];    [_topView addSubview:self];}- (void)startBackgroundViewAnimationIsOpen:(BOOL)isMasking{    if (isMasking)    {        ((UIVisualEffectView *)_backgroundView).hidden = (_backgroundViewType == HyRoundMenuViewBackgroundViewTypeCustomColors);        [UIView animateWithDuration:0.3f animations:^{//customBackgroundViewColor            if (_backgroundViewType != HyRoundMenuViewBackgroundViewTypeCustomColors) ((UIVisualEffectView *)_backgroundView).effect = [UIBlurEffect effectWithStyle:_blurEffectStyle];            if (_backgroundViewType == HyRoundMenuViewBackgroundViewTypeCustomColors) self.backgroundColor = _customBackgroundViewColor;        }];    }    else    {        [UIView animateWithDuration:0.3f animations:^{            if (_backgroundViewType != HyRoundMenuViewBackgroundViewTypeCustomColors) ((UIVisualEffectView *)_backgroundView).effect = nil;            if (_backgroundViewType == HyRoundMenuViewBackgroundViewTypeCustomColors) self.backgroundColor = [UIColor clearColor];        } completion:^(BOOL finished) {            _backgroundView.hidden = _backgroundViewType == HyRoundMenuViewBackgroundViewTypeCustomColors;        }];    }}static BOOL isMasking = false;- (void) touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    [super touchesBegan:touches withEvent:event];    isMasking = !isMasking;        [self startBackgroundViewAnimationIsOpen:isMasking];}- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{    id obj = [super hitTest:point withEvent:event];    return obj;}@end

具体实现，也没什么好说的，千万记得hitTest在这里面的功用就行了，其实遮罩层的hitTest方法并没有达到什么作用，但是为什么保留呢？

因为这个方法在“过滤”的效果非常好用，以后在别的需求会讲到这个方法的作用

实现是转载学习于：

https://github.com/wwdc14/HyRoundMenuView

0 0