iOS添加蒙层(遮盖层),遮盖层上放控件

//

//效果图如上

下面直接上代码

#import <UIKit/UIKit.h>

@interface MaskView :
UIView<UIGestureRecognizerDelegate>

-(instancetype)initWithFrame:(CGRect)frame;

+(instancetype)makeViewWithMask:(CGRect)frame andView:(UIView*)view;

-(void)block:(void(^)())block;

@end

#import "MaskView.h"

#import "AppDelegate.h"

@implementation MaskView

//初始化View以及添加单击蒙层逻辑

-(instancetype)initWithFrame:(CGRect)frame{

if (self = [super
initWithFrame:frame]) {

self.frame = frame;

//在这里需要用下边的方法设定Alpha值,第一种方法会使子视图的Alpha值和父视图的一样.

// self.backgroundColor = [UIColor colorWithRed:(40/255.0f) green:(40/255.0f) blue:(40/255.0f) alpha:1.0f];

self.backgroundColor = [[UIColor
lightGrayColor] colorWithAlphaComponent:1];

self.userInteractionEnabled =
YES;

UITapGestureRecognizer *pan = [[UITapGestureRecognizer
alloc]
initWithTarget:self
action:@selector(removeView)];

[self
addGestureRecognizer:pan];

}

return
self;

}

//蒙层添加到Window上

+(instancetype)makeViewWithMask:(CGRect)frame andView:(UIView*)view{

MaskView *mview = [[self
alloc]initWithFrame:frame];

AppDelegate *delegate = (AppDelegate *)[UIApplication
sharedApplication].delegate;

[delegate.window
addSubview:mview];

[mview addSubview:view];

return mview;

}

//单击蒙层取消蒙层

-(void)removeView{

[self
removeFromSuperview];

}

//通过回调取消蒙层

-(void)block:(void(^)())block{

[self
removeFromSuperview];

block();

}

@end

#import "MaskViewController.h"

#import "MaskView.h"

#import "AppDelegate.h"

@interface
MaskViewController ()

@property (nonatomic ,strong)MaskView *maskView;

@end

@implementation MaskViewController

- (void)viewDidLoad {

[super
viewDidLoad];

//添加一个添加蒙层按扭

self.view.backgroundColor = [UIColor
whiteColor];

UIButton *btn = [[UIButton
alloc] initWithFrame:CGRectMake(self.view.frame.size.width/2-50,
100, 100,
40)];

btn.backgroundColor = [UIColor
yellowColor];

[btn setTitle:@"添加蒙层"
forState:UIControlStateNormal];

[btn setTitleColor:[UIColor
blackColor] forState:
UIControlStateNormal];

[btn addTarget:self
action:@selector(btn:)
forControlEvents: UIControlEventTouchUpInside];

[self.view
addSubview:btn];

}

-(void)btn:(UIButton *)sender{

UIButton *btn1 = [[UIButton
alloc] initWithFrame:CGRectMake(self.view.frame.size.width/2-75,
100, 150,
150)];

btn1.backgroundColor = [[UIColor
redColor]colorWithAlphaComponent:0.5];

[btn1 setTitle:@"取消蒙层"
forState:UIControlStateNormal];

//在蒙层上放的控件调用取消蒙层逻辑

[btn1 addTarget:self
action:@selector(btn1:)
forControlEvents: UIControlEventTouchUpInside];

[self.view
addSubview:btn1];

//添加蒙层,以及蒙层上放的控件

_maskView = [MaskView
makeViewWithMask:CGRectMake(0,
0, self.view.frame.size.width,
self.view.frame.size.height)
andView:btn1];

}

-(void)btn1:(UIButton *)sender{

//取消蒙层

[_maskView
block:^{

NSLog(@"取消之后");

}];

}