1.概述

APP的开发中肯定会涉及到弹框, 虽然有系统自带的弹框, 但往往是不足以应对开发中的弹框的, 所以这里就本人项目中使用到的弹框来分享一下自己的弹框设计.

弹窗.gif

2. 栗子

新建一个继承自UIView的弹窗文件, 在.h文件里是这样的

#import <UIKit/UIKit.h>

@interface RSAlertView : UIView

#pragma mark - 提示登录的弹框
- (instancetype)initIfLogin;


// 登录的block
@property (nonatomic, copy) void(^loginBlock)();

// 注册的block
@property (nonatomic, copy) void(^registerBlock)();


- (void)showRSAlertView;

@end

蓝后, 在.m文件里是这样的

#import "RSAlertView.h"

@interface RSAlertView()

//弹窗
@property (nonatomic,retain) UIView *alertView;

@end

@implementation RSAlertView

#pragma mark - 提示登录的弹框
- (instancetype)initIfLogin{
    
    if (self == [super init]) {
        
//        [self removeFromSuperview];
        
        // 底面蒙版
        self.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height);
        self.backgroundColor = [UIColor grayColor];
        
        
        // 白色弹框
        self.alertView = [[UIView alloc] init];
        self.alertView.backgroundColor = [UIColor whiteColor];
        self.alertView.layer.cornerRadius = 10;
        self.layer.masksToBounds = YES;
        self.alertView.bounds = CGRectMake(0, 0, 300, 300);
        self.alertView.center = self.center;
        [self addSubview:self.alertView];
        
        // 标题
        UILabel *titleLab = [[UILabel alloc] init];
        titleLab.font = [UIFont systemFontOfSize:16];
        titleLab.textColor = [UIColor blackColor];
        titleLab.textAlignment = NSTextAlignmentCenter;
        [self.alertView addSubview:titleLab];
        titleLab.frame = CGRectMake(0, 0, 200, 30);
        titleLab.text = @"请先登录/注册再进行操作";

        
        // 注册 按钮
        UIButton *registerBtn = [[UIButton alloc] initWithFrame:CGRectMake(10, 150, 100, 30)];
        [registerBtn setTitle:@"注册" forState:UIControlStateNormal];
        registerBtn.backgroundColor = [UIColor blueColor];
        [registerBtn addTarget:self action:@selector(registerBtnClick) forControlEvents:UIControlEventTouchUpInside];
        [registerBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        // 圆角, 边框
        registerBtn.layer.cornerRadius = 10;
        registerBtn.layer.masksToBounds = YES;
        [self.alertView addSubview:registerBtn];

        
        // 登录 按钮
        UIButton *loginBtn = [[UIButton alloc] initWithFrame:CGRectMake(120, 150, 100, 30)];
        [loginBtn setTitle:@"登录" forState:UIControlStateNormal];
        [loginBtn addTarget:self action:@selector(loginBtnClick) forControlEvents:UIControlEventTouchUpInside];
        loginBtn.backgroundColor = [UIColor orangeColor];
        // 圆角, 边框
        loginBtn.layer.cornerRadius = 10;
        loginBtn.layer.masksToBounds = YES;
        [self.alertView addSubview:loginBtn];
        
        // 点击手势
        UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handletapPressInAlertViewGesture:)];
        [self addGestureRecognizer:tapGesture];
        
    }
    
    return self;
    
}

- (void)registerBtnClick{

    if (self.registerBlock) {
        self.registerBlock();
    }
    
    [self removeFromSuperview];
    
}

- (void)loginBtnClick{
    
    if (self.loginBlock) {
        self.loginBlock();
    }
    [self removeFromSuperview];
}

// 点击其他区域关闭弹窗
- (void)handletapPressInAlertViewGesture:(UITapGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateEnded){
        CGPoint location = [sender locationInView:nil];
        if (![_alertView pointInside:[_alertView convertPoint:location fromView:_alertView.window] withEvent:nil]){
            [_alertView.window removeGestureRecognizer:sender];
            [self removeFromSuperview];
        }
    }
}


#pragma mark - 弹出 -
- (void)showRSAlertView
{
    
     UIWindow *rootWindow = [UIApplication sharedApplication].keyWindow;
    
    [rootWindow addSubview:self];
    
    [self creatShowAnimation];
}

#pragma mark - 弹出的动画
- (void)creatShowAnimation
{
    self.alertView.layer.position = self.center;
    self.alertView.transform = CGAffineTransformMakeScale(0.90, 0.90);
    [UIView animateWithDuration:0.25 delay:0 usingSpringWithDamping:0.8 initialSpringVelocity:1 options:UIViewAnimationOptionCurveLinear animations:^{
        self.alertView.transform = CGAffineTransformMakeScale(1.0, 1.0);
    } completion:^(BOOL finished) {
    }];
}


@end

3. 弹窗的使用和你可能会遇到的坑

在你需要的页面中, 需要的地方直接创建和弹出就可以了, 例如这样的

    /*
    登录的弹框
     d*/
    RSAlertView *alerV = [[RSAlertView alloc] initIfLogin];
    alerV.registerBlock = ^{
        
        NSLog(@"注册的block");
    };
    alerV.loginBlock = ^(){
    
        NSLog(@"登录的block");
    };
    [alerV showRSAlertView];

在你做测试demo的过程中, 可能你会遇到弹窗无法弹出来的情况, 这时候你到处找原因, 还可能找不到. 这个坑我也遇到, 那就是在viewDidLoad或者viewWillAppear等方法里面创建了弹框, 这时候弹框是显示不出来的.

找原因的话你可能会发现原因是[UIApplication sharedApplication].keyWindow为nil. 为啥呢???

关于这个问题, 也是个坑, 可以看我的另一篇文章里面, 有对这个的一些探究
iOS [UIApplication sharedApplication].keyWindow为nil的分析

end