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最近项目中有个需求：要画一个页面，页面的顶部是半透明显示上一个控制器的页面。类似下面这张图：

之前在寻找泡泡效果的弹框时，遇见过，所以知道这个是可以实现的。于是百度了一番，写出来如下代码：

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//--------------------------------------------
//SGH0524PresentAViewController.m
#import "SGH0524PresentAViewController.h"
#import <Masonry.h>
#import "SGH0524PresentBViewController.h"
@interface SGH0524PresentAViewController ()
@end
@implementation SGH0524PresentAViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    UIButton *button = ({
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.titleLabel.font = [UIFont systemFontOfSize:16];
        button.layer.cornerRadius = 3;
        button.clipsToBounds = YES;
        button.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.3];
        button.tag = 104;
        [button setTitle:@"A Controller Button" forState:UIControlStateNormal];
        button.titleLabel.textAlignment = NSTextAlignmentCenter;
        [button addTarget:self action:@selector(p_presentClick) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:button];
        button;
    });
    
    [button mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.view);
        make.top.equalTo(self.view).offset( 100 );
    }];
}
-(void)p_presentClick {
    SGH0524PresentBViewController *vc = [[SGH0524PresentBViewController alloc]init];
    
    //self.definesPresentationContext = YES;
    //大于等于 iOS8.0
    if ([[[UIDevice currentDevice] systemVersion] compare:@"8.0" options:NSNumericSearch] != NSOrderedAscending) {
        vc.modalPresentationStyle = UIModalPresentationOverCurrentContext;
    }
    else {
        vc.modalPresentationStyle = UIModalPresentationCurrentContext;
        vc.navigationController.modalPresentationStyle = UIModalPresentationCurrentContext;
    }
    [self presentViewController:vc animated:YES completion:^{ }];
}
@end
//--------------------------------------------
//SGH0524PresentBViewController.m
#import "SGH0524PresentBViewController.h"
#import <Masonry.h>
@interface SGH0524PresentBViewController ()
@end
@implementation SGH0524PresentBViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.3];
    
    UIButton *button = ({
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.titleLabel.font = [UIFont systemFontOfSize:16];
        button.layer.cornerRadius = 3;
        button.clipsToBounds = YES;
        button.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.3];
        button.tag = 104;
        [button setTitle:@"B Controller Button" forState:UIControlStateNormal];
        button.titleLabel.textAlignment = NSTextAlignmentCenter;
        [self.view addSubview:button];
        button;
    });
    
    [button mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.view);
        make.top.equalTo(self.view).offset( 150 );
    }];
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [self dismissViewControllerAnimated:YES completion:nil];
}
@end

效果如下：

来自：iOS学习笔记05 可以看到上一层内容的半透明的界面

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