• (20160601)开源第三方学习之SVProgressHUD


    SVProgressHUD相信在很多项目中都有运用,运用于弹出窗提示效果;

    地址:https://github.com/SVProgressHUD/SVProgressHUD

    一:插件的运用

    1.1 首先SVProgressHUD是一个单例([SVProgressHUD method]),所以可以使用起来也相当方便跟简单,可以写在任意位置;但必须在主线程中进行显示,或则会报闪退;也可以用于显示一个提示信息。所述显示时间取决于给定的字符串的长度( 0.5至5秒)

    其中几种展现:
    + (void)showInfoWithStatus:(NSString *)string;
    + (void)showSuccessWithStatus:(NSString*)string;
    + (void)showErrorWithStatus:(NSString *)string;
    + (void)showImage:(UIImage*)image status:(NSString*)string;
    + (void)showProgress:(float)progress status:(NSString*)status;
    
    简单HUD销毁:
    + (void)dismiss;
    + (void)dismissWithDelay:(NSTimeInterval)delay;
    + (void)dismissWithCompletion:(SVProgressHUDDismissCompletion)completion;
    + (void)dismissWithDelay:(NSTimeInterval)delay completion:(SVProgressHUDDismissCompletion)completion;
    
    批量HUD销毁
    + (void)popActivity;

     

    1.2  SVProgressHUD可通过下列方法进行个性化定制:

    + (void)setDefaultStyle:(SVProgressHUDStyle)style;                  // 默认是SVProgressHUDStyleLight
    + (void)setDefaultMaskType:(SVProgressHUDMaskType)maskType;         // 默认是SVProgressHUDMaskTypeNone
    + (void)setDefaultAnimationType:(SVProgressHUDAnimationType)type;   // 默认是 SVProgressHUDAnimationTypeFlat
    + (void)setRingThickness:(CGFloat)width;                            // 默认是 2 pt
    + (void)setCornerRadius:(CGFloat)cornerRadius;                      // 默认是 14 pt
    + (void)setFont:(UIFont*)font;                                      // 默认是 [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline]
    + (void)setForegroundColor:(UIColor*)color;                         // 默认是 [UIColor blackColor], 仅对 SVProgressHUDStyleCustom 有效
    + (void)setBackgroundColor:(UIColor*)color;                         // 默认是 [UIColor whiteColor], 仅对 SVProgressHUDStyleCustom 有效
    + (void)setInfoImage:(UIImage*)image;                               //默认是bundle文件夹中的提示图片.
    + (void)setSuccessImage:(UIImage*)image;                            // 默认是bundle文件夹中的成功图片.
    + (void)setErrorImage:(UIImage*)image;                              // 默认是bundle文件夹中的错误图片.
    + (void)setViewForExtension:(UIView*)view;                          // 默认是nil,仅当设置了 #define SV_APP_EXTENSIONS 时有效.

    所以我们可以对于SVProgressHUD做一些调整,比如图标跟文字的显示,背景色等;已经是相当的灵活;

     

    1.3 SVProgressHUD带的四个通知,通过NSNotificationCenter 注册4份通知,以响应正在显示/消失:

    SVProgressHUDWillAppearNotification 提示框即将出现

    SVProgressHUDDidAppearNotification 提示框已经出现

    SVProgressHUDWillDisappearNotification 提示框即将消失

    SVProgressHUDDidDisappearNotification 提示框已经消失

     

    每个通知传递一个userInfo字典,字典中包含HUD的状态字符串(如果有的话) ,可通过SVProgressHUDStatusUserInfoKey作为键来获取。

    SVProgressHUD还发送通知:

    SVProgressHUDDidReceiveTouchEventNotification当用户触摸整体屏幕上

    ' SVProgressHUDDidTouchDownInsideNotification当用户直接在HUD接触。这两个通知没有 userInfo参数,但包含了有关的触摸的UIEvent` 参数.

    实例:
    
    - (void)viewWillAppear:(BOOL)animated {
        [super viewWillAppear:animated];
        
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(handleNotification:)
                                                     name:SVProgressHUDWillAppearNotification
                                                   object:nil];
        
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(handleNotification:)
                                                     name:SVProgressHUDDidAppearNotification
                                                   object:nil];
        
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(handleNotification:)
                                                     name:SVProgressHUDWillDisappearNotification
                                                   object:nil];
        
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(handleNotification:)
                                                     name:SVProgressHUDDidDisappearNotification
                                                   object:nil];
    }
    
    - (void)handleNotification:(NSNotification *)notification {
        NSLog(@"Notification recieved: %@", notification.name);
        NSLog(@"Status user info key: %@", notification.userInfo[SVProgressHUDStatusUserInfoKey]);
    }
    
    输出的内容为,其中Useful Information为提示的文本内容:
    
    SVProgressHUD[793:34162] Notification recieved: SVProgressHUDWillAppearNotification
    2016-06-09 21:00:13.285 SVProgressHUD[793:34162] Status user info key: Useful Information.

     

    1.4 相关属性介绍

    1.4.1  SVProgressHUDAnimationType 动作类型

    [SVProgressHUD setDefaultAnimationType:SVProgressHUDAnimationTypeFlat]; 圆圈的转动动作
    [SVProgressHUD setDefaultAnimationType:SVProgressHUDAnimationTypeNative]; 菊花型的转动动作

    1.4.2  SVProgressHUDMaskType 弹出窗后面的背景效果类型:

    SVProgressHUDMaskTypeNone : 当提示显示的时间,用户仍然可以做其他操作,比如View 上面的输入等
    SVProgressHUDMaskTypeClear : 用户不可以做其他操作
    SVProgressHUDMaskTypeBlack : 用户不可以做其他操作,并且背景色是黑色
    SVProgressHUDMaskTypeGradient : 用户不可以做其他操作,并且背景色是渐变的
    
    除了插件自带的几种效果,还可以自定义背景色的效果
    [SVProgressHUD setBackgroundLayerColor:[[UIColor redColor] colorWithAlphaComponent:0.4]];
    [SVProgressHUD setDefaultMaskType:SVProgressHUDMaskTypeCustom];

    1.4.3  SVProgressHUDStyle 弹出窗的样式

     [SVProgressHUD setDefaultStyle:SVProgressHUDStyleLight]; 窗的背景块是白色,字跟圆圈是黑色
     [SVProgressHUD setDefaultStyle:SVProgressHUDStyleDark]; 窗的背景块是黑色,字跟圆圈是白色
    
    若要自定义必须先设setDefaultStyle为SVProgressHUDStyleCustom,再进行setForegroundColor,setBackgroundColor的配置.

    1.5:相关代码

    1.5.1 SVProgressHUD消息的时间

    + (NSTimeInterval)displayDurationForString:(NSString*)string {
        return MAX((float)string.length * 0.06 + 0.5, [self sharedView].minimumDismissTimeInterval);
    }

    设置一个最大值,至少是0.5秒,其它时间按提示的文本字数长度决定;

    1.5.2 设定某个效果不影响全局属性

    + (void)showSuccessWithStatus:(NSString*)status maskType:(SVProgressHUDMaskType)maskType {
        SVProgressHUDMaskType existingMaskType = [self sharedView].defaultMaskType;
        [self setDefaultMaskType:maskType];
        [self showSuccessWithStatus:status];
        [self setDefaultMaskType:existingMaskType];
    }

    首先保存全局的效果值,然后显示当前的效果,完成后又把当前的效果值换成刚才的全局效果,这样就可以兼容全局效果跟本次效果的转换;

    1.5.3通知并传递内容

    创建消息通知:
    
        [[NSNotificationCenter defaultCenter] postNotificationName:SVProgressHUDDidReceiveTouchEventNotification
                                                            object:self
                                                          userInfo:[self notificationUserInfo]];
    
    传递的内容:
    
    - (NSDictionary*)notificationUserInfo{
        return (self.statusLabel.text ? @{SVProgressHUDStatusUserInfoKey : self.statusLabel.text} : nil);
    }

    把当前提示的内容传递给通知,方便后面在接收到消息时可以做处理;

     

    二:知识点

    2.1 使用 __attribute__, deprecated 关键字表示已过时的API

    + (void)showWithMaskType:(SVProgressHUDMaskType)maskType __attribute__((deprecated("Use show and setDefaultMaskType: instead.")));

    此方法已经过时了,如果在项目中有运用到此方法编译器就会报出相应的警告;如下面截图,就是用到此方法时报的警告;

    知识点扩展(其它可以见__attribute__是GNU C特色之一,在iOS用的比较广泛):

    a:unavailable告诉编译器该方法不可用

    作用:告诉编译器该方法不可用,如果强行调用编译器会提示错误。比如某个类在构造的时候不想直接通过init来初始化,只能通过特定的初始化方法,就可以将init方法标记为unavailable。用法:__attribute__((unavailable))

    例子:
    
    #define UNAVAILABLE_ATTRIBUTE __attribute__((unavailable))
    #define NS_UNAVAILABLE UNAVAILABLE_ATTRIBUTE
    
    #import <Foundation/Foundation.h>
    
    @interface Person : NSObject
    @property(nonatomic,copy) NSString *name;
    @property(nonatomic,assign) NSUInteger age;
    
    - (instancetype)init NS_UNAVAILABLE;
    - (instancetype)initWithName:(NSString *)name age:(NSUInteger)age;
    
    @end

    b:属性后面加UI_APPEARANCE_SELECTOR表示这个是影响全局

    @property (assign, nonatomic) SVProgressHUDStyle defaultStyle UI_APPEARANCE_SELECTOR;                   // default is SVProgressHUDStyleLight
    @property (assign, nonatomic) SVProgressHUDMaskType defaultMaskType UI_APPEARANCE_SELECTOR;             // default is SVProgressHUDMaskTypeNone
    @property (assign, nonatomic) SVProgressHUDAnimationType defaultAnimationType UI_APPEARANCE_SELECTOR;   // default is SVProgressHUDAnimationTypeFlat
    @property (assign, nonatomic) CGSize minimumSize UI_APPEARANCE_SELECTOR;            // default is CGSizeZero, can be used to avoid resizing for a larger message

    2.2 关键字extern 用于修饰常量可以让外面的引用文件应用

    在头文件中使用extern来声明全局常量,并在相关实现文件中定义其值,这种常量要出现在全局符号表中,所以其名称应加以区别,通常用与之相关的类名做前缀;

    在SVProgressHUD.h文件中定义的这些const

    extern NSString * const SVProgressHUDDidReceiveTouchEventNotification;
    extern NSString * const SVProgressHUDDidTouchDownInsideNotification;
    extern NSString * const SVProgressHUDWillDisappearNotification;
    extern NSString * const SVProgressHUDDidDisappearNotification;
    extern NSString * const SVProgressHUDWillAppearNotification;
    extern NSString * const SVProgressHUDDidAppearNotification;
    extern NSString * const SVProgressHUDStatusUserInfoKey;
    
    @interface SVProgressHUD : UIView
    @end

    然后在SVProgressHUD.m

    NSString * const SVProgressHUDDidReceiveTouchEventNotification = @"SVProgressHUDDidReceiveTouchEventNotification";
    NSString * const SVProgressHUDDidTouchDownInsideNotification = @"SVProgressHUDDidTouchDownInsideNotification";
    NSString * const SVProgressHUDWillDisappearNotification = @"SVProgressHUDWillDisappearNotification";
    NSString * const SVProgressHUDDidDisappearNotification = @"SVProgressHUDDidDisappearNotification";
    NSString * const SVProgressHUDWillAppearNotification = @"SVProgressHUDWillAppearNotification";
    NSString * const SVProgressHUDDidAppearNotification = @"SVProgressHUDDidAppearNotification";
    NSString * const SVProgressHUDStatusUserInfoKey = @"SVProgressHUDStatusUserInfoKey";
    
    
    @interface SVProgressHUD ()
    @end

    就可以在其它地方进行运用:

    - (void)viewWillAppear:(BOOL)animated {
        [super viewWillAppear:animated];
        
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(handleNotification:)
                                                     name:SVProgressHUDWillAppearNotification
                                                   object:nil];
        
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(handleNotification:)
                                                     name:SVProgressHUDDidAppearNotification
                                                   object:nil];
        
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(handleNotification:)
                                                     name:SVProgressHUDWillDisappearNotification
                                                   object:nil];
        
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(handleNotification:)
                                                     name:SVProgressHUDDidDisappearNotification
                                                   object:nil];
    }
    
    - (void)handleNotification:(NSNotification *)notification {
        NSLog(@"Notification recieved: %@", notification.name);
        NSLog(@"Status user info key: %@", notification.userInfo[SVProgressHUDStatusUserInfoKey]);
    }

    2.3生成Bundle包及运用

    Bundle简单理解,就是资源文件包。我们将许多图片、XIB、文本文件组织在一起,打包成一个Bundle文件。方便在其他项目中引用包内的资源。Bundle是静态的,也就是说,我们包含到包中的资源文件作为一个资源包是不参加项目编译的。也就意味着,bundle包中不能包含可执行的文件。它仅仅是作为资源,被解析成为特定的2进制数据。默认生成的配置跟strings文件都是可以删除;将要使用的bundle集成到项目中后,就可以使用了。需要注意的就是,bundle是静态的,不进行编译的资源文件。所以,要使用bundle中的资源,就需要找到相应的资源路径。

            NSBundle *bundle = [NSBundle bundleForClass:[SVProgressHUD class]];
            NSURL *url = [bundle URLForResource:@"SVProgressHUD" withExtension:@"bundle"];
            NSBundle *imageBundle = [NSBundle bundleWithURL:url];
            
            UIImage* infoImage = [UIImage imageWithContentsOfFile:[imageBundle pathForResource:@"info" ofType:@"png"]];
            UIImage* successImage = [UIImage imageWithContentsOfFile:[imageBundle pathForResource:@"success" ofType:@"png"]];
            UIImage* errorImage = [UIImage imageWithContentsOfFile:[imageBundle pathForResource:@"error" ofType:@"png"]];

    当然也可以定义宏来简化代码:

    #define MYBUNDLE_NAME @ "SVProgressHUD.bundle"
    #define MYBUNDLE_PATH [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: MYBUNDLE_NAME]
    #define MYBUNDLE [NSBundle bundleWithPath: MYBUNDLE_PATH]

    其它一些扩展:

    NSString * bundlePath = [[ NSBundle mainBundle] pathForResource: @ "MyBundle" ofType :@ "bundle"];
    NSBundle *resourceBundle = [NSBundle bundleWithPath:bundlePath];
    UIViewController *vc = [[UIViewController alloc] initWithNibName:@"vc_name" bundle:resourceBundle];
    
    图片获得bundle中的资源
    
    UIImageView *imgView=[[UIImageView alloc] initWithFrame:CGRectMake(50, 50, 50, 50)];
    UIImage *image = [UIImage imageNamed:@"MyBundle.bundle/img_collect_success"];
    [imgView setImage:image];
    
    或者
    
    UIImageView *imgView=[[UIImageView alloc] initWithFrame:CGRectMake(50, 50, 50, 50)];
    NSString *imgPath= [bundlePath stringByAppendingPathComponent :@"img_collect_success.png"];
    UIImage *image_1=[UIImage imageWithContentsOfFile:imgPath];
    [imgView setImage:image_1];

    2.4 UIView的Tint Color属性

    在iOS 7后,UIView新增加了一个tintColor属性,这个属性定义了一个非默认的着色颜色值,其值的设置会影响到以视图为根视图的整个视图层次结构。它主要是应用到诸如app图标、导航栏、按钮等一些控件上,以获取一些有意思的视觉效果。

    默认情况下,一个视图的tintColor是为nil的,这意味着视图将使用父视图的tint color值。当我们指定了一个视图的tintColor后,这个色值会自动传播到视图层次结构(以当前视图为根视图)中所有的子视图上。如果系统在视图层次结构中没有找到一个非默认的tintColor值,则会使用系统定义的颜色值(蓝色,RGB值为[0,0.478431,1],我们可以在IB中看到这个颜色)。因此,这个值总是会返回一个颜色值,即我们没有指定它。

    如果我们想指定整个App的tint color,则可以通过设置window的tint color。这样同一个window下的所有子视图都会继承此tint color

    若想了解关于Tint Color属性可以查看这篇文章

     

    2.5 UIImage的渲染模式:UIImage.renderingMode

    正如2.4点所介绍那些,在IOS7以后UIImage也会受到Tint Color的影响,着色(Tint Color)是iOS7界面中的一个.设置UIImage的渲染模式:UIImage.renderingMode重大改变,你可以设置一个UIImage在渲染时是否使用当前视图的Tint Color。UIImage新增了一个只读属性:renderingMode,对应的还有一个新增方法:imageWithRenderingMode:,它使用UIImageRenderingMode枚举值来设置图片的renderingMode属性。该枚举中包含下列值:

    UIImageRenderingModeAutomatic  // 根据图片的使用环境和所处的绘图上下文自动调整渲染模式(默认)。  
    UIImageRenderingModeAlwaysOriginal   // 始终绘制图片原始状态,不使用Tint Color。  
    UIImageRenderingModeAlwaysTemplate   // 始终根据Tint Color绘制图片,忽略图片的颜色信息。 

    运用:

    UIImage *img = [UIImage imageNamed:@ "myimage" ]; 
    img = [img imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]; 

    当然也可以兼容,是否有imageWithRenderingMode再做处理:

            if ([[UIImage class] instancesRespondToSelector:@selector(imageWithRenderingMode:)]) {
                _infoImage = [infoImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
                _successImage = [successImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
                _errorImage = [errorImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
            } else {
                _infoImage = infoImage;
                _successImage = successImage;
                _errorImage = errorImage;
            }

    2.6 UIControl

    在开发应用的时候,经常会用到各种各样的控件,诸如按钮(UIButton)、滑块(UISlider)、分页控件(UIPageControl)等。这些控件用来与用户进行交互,响应用户的操作。我们查看这些类的继承体系,可以看到它们都是继承于UIControl类。UIControl是控件类的基类,它是一个抽象基类,我们不能直接使用UIControl类来实例化控件,它只是为控件子类定义一些通用的接口,并提供一些基础实现,以在事件发生时,预处理这些消息并将它们发送到指定目标对象上。UIControl也是UIView的子类;想详细了解UIControl可以查看这文章;下面创建一个控件实例:

    #import <UIKit/UIKit.h>
    
    @interface ImageControl : UIControl
    
    - (instancetype)initWithFrame:(CGRect)frame title:(NSString *)title image:(UIImage *)image;
    
    @end
    #import "ImageControl.h"
    
    @implementation ImageControl {
        
        UILabel     *_label;
        UIImageView *_imageView;
    }
    
    - (instancetype)initWithFrame:(CGRect)frame title:(NSString *)title image:(UIImage *)image {
        
        self = [super initWithFrame:frame];
        
        if (self) {
            
            self.backgroundColor = [UIColor clearColor];
            self.layer.borderWidth = 1.0f;
            self.layer.borderColor = [UIColor grayColor].CGColor;
            self.layer.cornerRadius = 5.0f;
            self.layer.masksToBounds = YES;
            
            CGFloat width = CGRectGetWidth(self.bounds);
            CGFloat height = CGRectGetHeight(self.bounds);
            
            [self addSubview:({
                
                _imageView = [[UIImageView alloc] initWithFrame:self.bounds];
                _imageView.image = image;
                _imageView;
            })];
            
            
            [self addSubview:({
                _label = [[UILabel alloc] initWithFrame:(CGRect){0.0f, height - 30.0f, width, 30.0f}];
                _label.textAlignment = NSTextAlignmentCenter;
                _label.textColor = [UIColor whiteColor];
                _label.text = title;
                _label;
            })];
        }
        
        return self;
    }
    
    - (void)sendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event {
        
        // 由对象本身来处理事件
        [super sendAction:@selector(handleAction:) to:self forEvent:event];
    }
    
    - (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
        [super beginTrackingWithTouch:touch withEvent:event];
        
        NSLog(@"Begin %d", self.tracking);
        
        return YES;
    }
    
    - (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
        [super continueTrackingWithTouch:touch withEvent:event];
        
        NSLog(@"Continue %d %@", self.tracking, (self.touchInside ? @"YES" : @"NO"));
        
        return YES;
    }
    
    - (void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
        [super endTrackingWithTouch:touch withEvent:event];
        
        CGPoint position = [touch locationInView:self];
        
        if (CGRectContainsPoint(_label.frame, position)) {
            
            // 在此触发一个UIControlEventTouchUpInside事件行为
            [self sendActionsForControlEvents:UIControlEventTouchUpInside];
        }
        
        NSLog(@"End %d", self.tracking);
    }
    
    - (void)cancelTrackingWithEvent:(UIEvent *)event {
        [super cancelTrackingWithEvent:event];
        
        NSLog(@"Cancel");
    }
    
    - (void)handleAction:(id)sender {
        
        NSLog(@"handle Action");
        
        NSLog(@"target-actoin: %@", self.allTargets);
    }
    
    //- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    //    [super touchesBegan:touches withEvent:event];
    //    
    //    NSLog(@"Touch began");
    //}
    //
    //- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    //    
    //    [super touchesMoved:touches withEvent:event];
    //    
    //    NSLog(@"Touch Moved");
    //}
    //
    //- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    //    [super touchesEnded:touches withEvent:event];
    //    
    //    NSLog(@"Touch End");
    //}
    //
    //- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    //    
    //    [super touchesCancelled:touches withEvent:event];
    //    
    //    NSLog(@"Touch Cancel");
    //}
    
    @end

     而在SVProgressHUD中的运用如下:

    - (UIControl*)overlayView {
        if(!_overlayView) {
    #if !defined(SV_APP_EXTENSIONS)
            CGRect windowBounds = [[[UIApplication sharedApplication] delegate] window].bounds;
            _overlayView = [[UIControl alloc] initWithFrame:windowBounds];
    #else
            _overlayView = [[UIControl alloc] initWithFrame:[UIScreen mainScreen].bounds];
    #endif
            _overlayView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
            _overlayView.backgroundColor = [UIColor clearColor];
            [_overlayView addTarget:self action:@selector(overlayViewDidReceiveTouchEvent:forEvent:) forControlEvents:UIControlEventTouchDown];
        }
        return _overlayView;
    }

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  • 原文地址:https://www.cnblogs.com/wujy/p/5572762.html
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