自定义蒙版

#import <UIKit/UIKit.h>

@interface CqCover : UIView
//显示蒙版
+ (void)coverShow;
//隐藏蒙版
+ (void)coverHide;

@end
-----------------------------------------------------

#import "CqCover.h"

#define keyWindow [UIApplication sharedApplication].keyWindow

@implementation CqCover

+ (void)coverShow{
    CqCover *cover = [[CqCover alloc] initWithFrame:[UIScreen mainScreen].bounds];
    
    cover.alpha = 0.6;
    
    cover.backgroundColor = [UIColor grayColor];
    
    
    [keyWindow addSubview:cover];
    
}

+ (void)coverHide{
    for (UIView *cover in keyWindow.subviews) {
        if ([cover isKindOfClass:self]) {
            [cover removeFromSuperview];
        }
    }
}

#import <UIKit/UIKit.h>

@class CqPopMenu;
@protocol CqPopMenuDelegate <NSObject>
@optional
- (void)popMenuClickHide:(CqPopMenu *)popmenu;

@end

@interface CqPopMenu : UIView

/** 代理 */
@property(weak,nonatomic) id<CqPopMenuDelegate> delegate;

+ (instancetype)popMenu;

+ (instancetype)showInPoint:(CGPoint)point;

- (void)hideInPoint:(CGPoint)point andCompletion:(void(^)())completionBlock;

@end
---------------------------------------------------
#import "CqPopMenu.h"

#define keyWindow [UIApplication sharedApplication].keyWindow

@implementation CqPopMenu

- (void)hideInPoint:(CGPoint)point andCompletion:(void (^)())completionBlock{
    
    [UIView animateWithDuration:0.5 animations:^{
        self.center = point;
        
        self.transform = CGAffineTransformMakeScale(0.01, 0.01);
        
    }completion:^(BOOL finished) {
        [self removeFromSuperview];
        
        if (completionBlock) {
            completionBlock();
        }
        
    }];
    
    
}

- (IBAction)ClickHide:(id)sender {
    
    
    
    if ([self.delegate respondsToSelector:@selector(popMenuClickHide:)]) {
        [self.delegate popMenuClickHide:self];
    }
    
}

+ (instancetype)popMenu{
    return [[NSBundle mainBundle] loadNibNamed:@"CqPopMenu" owner:self options:nil][0];
    
}

+ (instancetype)showInPoint:(CGPoint)point{
    CqPopMenu *menu = [CqPopMenu popMenu];
    menu.center = point;
    [keyWindow addSubview:menu];
    return menu;
}

- (void)ativity{
    
    [CqCover coverShow];
    
    CGFloat screenW = [UIScreen mainScreen].bounds.size.width * 0.5;
    CGFloat screenH = [UIScreen mainScreen].bounds.size.height * 0.5;
    
    CqPopMenu *menu = [CqPopMenu showInPoint:CGPointMake(screenW, screenH)];
    menu.delegate = self;
    
    
    
}

- (void)popMenuClickHide:(CqPopMenu *)popmenu{
    
    [popmenu hideInPoint:CGPointMake(44, 44) andCompletion:^{
        [CqCover coverHide];
    }];
    
    
}