iOS弹出View同时使背影变暗

开发时，常常会遇到这种问题，点击按钮A，弹出视图B，同时背影变暗，点击背影视图B消失；

GitHub上有个很好的例子：：下载地址

 本文内容也截取于其，解决了上述例子中多次快速点击程序崩溃的问题。

附上效果图

弹出视图

代码：

//  AddView.h

#import <UIKit/UIKit.h>

@interface AddSpaceView : UIView<UIGestureRecognizerDelegate>
{
    UIView *parentView;
}
@property (nonatomic, strong) UIView *parentView;
@property (nonatomic, assign) id delegate;

- (id)initWithParentView:(UIView *)_parentView;
- (void)show;
- (void)close;

@end

　　

//  AddView.m

#import "AddView.h"

@implementation AddSpaceView
@synthesize parentView;
@synthesize delegate;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

- (id)initWithParentView:(UIView *)_parentView
{
    self = [super initWithFrame:_parentView.frame];
    if (self) {
        parentView = _parentView;
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(oneTap)];
        tap.delegate = self;
        [self addGestureRecognizer:tap];
    }
    return self;
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    if ([touch.view isKindOfClass:[UIButton class]]){
        return NO;
    }
    return YES;
}

-(void)show
{
    self.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0];
    
    [parentView addSubview:self];
    
    [UIView animateWithDuration:0.2f delay:0.0 options:UIViewAnimationOptionCurveEaseInOut
					 animations:^{
						 self.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.4f];
					 }
					 completion:NULL
     ];
}

- (void)close
{
    [UIView animateWithDuration:0.0f delay:0.0 options:UIViewAnimationOptionTransitionNone
					 animations:^{
						 self.backgroundColor = [UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.0f];
					 }
					 completion:^(BOOL finished) {
//                         for (UIView *v in [self subviews]) {
//                             [v removeFromSuperview];
//                         }
                         [self removeFromSuperview];
					 }
	 ];
}

- (void)oneTap
{
    [delegate closeAddSpaceView:self];
}

- (void)closeAddSpaceView: (AddSpaceView *)addSpaceView
{
    [self close];
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

@end

　　用法：

点击按钮时：

- (IBAction)showAddMenu:(id)sender
{
    self.popupView.layer.cornerRadius = 12;
    self.popupView.layer.rasterizationScale = [[UIScreen mainScreen] scale];
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    addSpaceView = [[AddSpaceView alloc] initWithParentView:window.rootViewController.view];
    self.popupView.center = addSpaceView.center;
    [addSpaceView setDelegate:self];
    [addSpaceView addSubview:self.popupView];
    [addSpaceView show];
}