1.概述

APP的開發中肯定會涉及到彈框, 雖然有系統自帶的彈框, 但往往是不足以應對開發中的彈框的, 所以這里就本人項目中使用到的彈框來分享一下自己的彈框設計.

彈窗.gif

2. 栗子

新建一個繼承自UIView的彈窗文件, 在.h文件里是這樣的

#import <UIKit/UIKit.h>

@interface RSAlertView : UIView

#pragma mark - 提示登錄的彈框
- (instancetype)initIfLogin;


// 登錄的block
@property (nonatomic, copy) void(^loginBlock)();

// 注冊的block
@property (nonatomic, copy) void(^registerBlock)();


- (void)showRSAlertView;

@end

藍后, 在.m文件里是這樣的

#import "RSAlertView.h"

@interface RSAlertView()

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

@end

@implementation RSAlertView

#pragma mark - 提示登錄的彈框
- (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];
        
        
        // 白色彈框
        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];
        
        // 標題
        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 = @"請先登錄/注冊再進行操作";

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

        
        // 登錄 按鈕
        UIButton *loginBtn = [[UIButton alloc] initWithFrame:CGRectMake(120, 150, 100, 30)];
        [loginBtn setTitle:@"登錄" forState:UIControlStateNormal];
        [loginBtn addTarget:self action:@selector(loginBtnClick) forControlEvents:UIControlEventTouchUpInside];
        loginBtn.backgroundColor = [UIColor orangeColor];
        // 圓角, 邊框
        loginBtn.layer.cornerRadius = 10;
        loginBtn.layer.masksToBounds = YES;
        [self.alertView addSubview:loginBtn];
        
        // 點擊手勢
        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];
}

// 點擊其他區域關閉彈窗
- (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 - 彈出 -
- (void)showRSAlertView
{
    
     UIWindow *rootWindow = [UIApplication sharedApplication].keyWindow;
    
    [rootWindow addSubview:self];
    
    [self creatShowAnimation];
}

#pragma mark - 彈出的動畫
- (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. 彈窗的使用和你可能會遇到的坑

在你需要的頁面中, 需要的地方直接創建和彈出就可以了, 例如這樣的

    /*
    登錄的彈框
     d*/
    RSAlertView *alerV = [[RSAlertView alloc] initIfLogin];
    alerV.registerBlock = ^{
        
        NSLog(@"注冊的block");
    };
    alerV.loginBlock = ^(){
    
        NSLog(@"登錄的block");
    };
    [alerV showRSAlertView];

在你做測試demo的過程中, 可能你會遇到彈窗無法彈出來的情況, 這時候你到處找原因, 還可能找不到. 這個坑我也遇到, 那就是在viewDidLoad或者viewWillAppear等方法里面創建了彈框, 這時候彈框是顯示不出來的.

找原因的話你可能會發現原因是[UIApplication sharedApplication].keyWindow為nil. 為啥呢???

關于這個問題, 也是個坑, 可以看我的另一篇文章里面, 有對這個的一些探究
iOS [UIApplication sharedApplication].keyWindow為nil的分析

end