SVProgressHUD 是一个干净，易于使用的HUD，旨在显示iOS和tvOS正在进行的任务的进展。
常用的还有MBProgressHUD.这两个都是很常用的HUD,大体相似,但是还是有一些不同的.
MBProgressHUD和SVProgressHUD的区别：
svprogresshud 使用起来很方便,但可定制差一些,看它的接口貌似只能添加一个全屏的HUD,不能把它添加到某个视图上面去.
MBProgressHUD 功能全一些,可定制高一些,而且可以指定加到某一个View上去.用起来可能就没上面那个方便了.
具体还要看你的使用场景.
附上GitHub源码地址:
SVProgressHUD:https://github.com/SVProgressHUD/SVProgressHUD
MBProgressHUD:https://github.com/jdg/MBProgressHUD
今天我们不对二者的区别做详解,有空我会专门写文章对它们的区别做一个详解.
今天我们主要简单介绍一下SVProgressHUD的使用.

安装

通过CocoaPods安装,在Podfile中加入pod 'SVProgressHUD',这里不多做介绍.可以参考文章: CocoaPods的简单使用

使用

SVProgressHUD是已经被创建为单例的,所以不需要被实例化了,可以直接使用.调用它的方法[SVProgressHUD method].

[SVProgressHUD show ];
dispatch_async（dispatch_get_global_queue（DISPATCH_QUEUE_PRIORITY_DEFAULT，0），^ {
     //耗时的任务
    dispatch_async（dispatch_get_main_queue（），^ {
        [SVProgressHUD dismiss ];
    }）;
}）;

显示HUD

可以在下拉刷新或者执行其他耗时任务的时候,使用下面方法之一,来显示不确定任务的状态:

+ (void)show;
+ (void)showWithStatus:(NSString*)string;

效果图分别为:

show(不带文字)

showWithStatus(带文字)

如果你希望HUD反应任务的进度,可以使用下面方法的其中一个:

+ (void)showProgress:(CGFloat)progress;
+ (void)showProgress:(CGFloat)progress status:(NSString*)status;

通过其他方式可以实现进度条的速度把控.比如:

- (IBAction)clickButtonsShowWithProgress:(id)sender {
    progress = 0.0f;
    [SVProgressHUD showProgress:0 status:@"Loading"];
    [self performSelector:@selector(increaseProgress) withObject:nil afterDelay:0.1f];
}

- (void)increaseProgress {
    progress += 0.05f;
    [SVProgressHUD showProgress:progress status:@"xuanhe Loading"];

    if(progress < 1.0f){
        [self performSelector:@selector(increaseProgress) withObject:nil afterDelay:0.1f];
    } else {
        [self performSelector:@selector(dismiss) withObject:nil afterDelay:0.4f];
    }
}

效果如下

进度

还有其他常用的语法:

+（void）showInfoWithStatus :( NSString *）string;
+（void）showSuccessWithStatus :( NSString *）string;
+（void）showErrorWithStatus :( NSString *）string;
+（void）showImage：（UIImage *）image status :( NSString *）string;

取消HUD

HUD可以使用以下方式解除：

+（void）dismiss;
+（void）dismissWithDelay :( NSTimeInterval）delay;
+ (void)dismissWithDelay:(NSTimeInterval)delay completion:(SVProgressHUDDismissCompletion)completion;

可以对这些代码进行改进,比如,在弹框结束后执行其他操作.可以封装一个方法,弹框结束后,执行Block.

定制

SVProgressHUD 可以通过以下方法定制：

+ (void)setDefaultStyle:(SVProgressHUDStyle)style;                  // default is SVProgressHUDStyleLight
+ (void)setDefaultMaskType:(SVProgressHUDMaskType)maskType;         // default is SVProgressHUDMaskTypeNone
+ (void)setDefaultAnimationType:(SVProgressHUDAnimationType)type;   // default is SVProgressHUDAnimationTypeFlat
+ (void)setContainerView:(UIView*)containerView;                    // default is window level
+ (void)setMinimumSize:(CGSize)minimumSize;                         // default is CGSizeZero, can be used to avoid resizing
+ (void)setRingThickness:(CGFloat)width;                            // default is 2 pt
+ (void)setRingRadius:(CGFloat)radius;                              // default is 18 pt
+ (void)setRingNoTextRadius:(CGFloat)radius;                        // default is 24 pt
+ (void)setCornerRadius:(CGFloat)cornerRadius;                      // default is 14 pt
+ (void)setBorderColor:(nonnull UIColor*)color;                     // default is nil
+ (void)setBorderWidth:(CGFloat)width;                              // default is 0
+ (void)setFont:(UIFont*)font;                                      // default is [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline]
+ (void)setForegroundColor:(UIColor*)color;                         // default is [UIColor blackColor], only used for SVProgressHUDStyleCustom
+ (void)setBackgroundColor:(UIColor*)color;                         // default is [UIColor whiteColor], only used for SVProgressHUDStyleCustom
+ (void)setBackgroundLayerColor:(UIColor*)color;                    // default is [UIColor colorWithWhite:0 alpha:0.4], only used for SVProgressHUDMaskTypeCustom
+ (void)setImageViewSize:(CGSize)size;                              // default is 28x28 pt
+ (void)setInfoImage:(UIImage*)image;                               // default is the bundled info image provided by Freepik
+ (void)setSuccessImage:(UIImage*)image;                            // default is bundled success image from Freepik
+ (void)setErrorImage:(UIImage*)image;                              // default is bundled error image from Freepik
+ (void)setViewForExtension:(UIView*)view;                          // default is nil, only used if #define SV_APP_EXTENSIONS is set
+ (void)setGraceTimeInterval:(NSTimeInterval)interval;              // default is 0 seconds
+ (void)setMinimumDismissTimeInterval:(NSTimeInterval)interval;     // default is 5.0 seconds
+ (void)setMaximumDismissTimeInterval:(NSTimeInterval)interval;     // default is CGFLOAT_MAX
+ (void)setFadeInAnimationDuration:(NSTimeInterval)duration;        // default is 0.15 seconds
+ (void)setFadeOutAnimationDuration:(NSTimeInterval)duration;       // default is 0.15 seconds
+ (void)setMaxSupportedWindowLevel:(UIWindowLevel)windowLevel;      // default is UIWindowLevelNormal
+ (void)setHapticsEnabled:(BOOL)hapticsEnabled;                     // default is NO

样式

作为标准SVProgressHUD提供两种预先配置的样式：

SVProgressHUDStyleLight白色背景黑色图标和文字
SVProgressHUDStyleDark黑色背景与白色图标和文本
如果要使用自定义颜色使用setForegroundColor和setBackgroundColor:。这些方法将HUD的风格置为SVProgressHUDStyleCustom。

触觉反馈

对于具有较新设备的用户（从iPhone 7开始），SVProgressHUD可以根据显示的HUD来自动触发触觉反馈。反馈图如下：

showSuccessWithStatus: < - > UINotificationFeedbackTypeSuccess
showInfoWithStatus: < - > UINotificationFeedbackTypeWarning
showErrorWithStatus: < - > UINotificationFeedbackTypeError

要启用此功能，请使用setHapticsEnabled: 。

具有iPhone 7之前的设备的用户将不会改变功能。

通知

SVProgressHUD发布四个通知，NSNotificationCenter以响应被显示/拒绝：

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

每个通知通过一个userInfo保存HUD状态字符串（如果有的话）的字典，可以通过检索SVProgressHUDStatusUserInfoKey。

SVProgressHUD SVProgressHUDDidReceiveTouchEventNotification当用户触摸整个屏幕或SVProgressHUDDidTouchDownInsideNotification用户直接触摸HUD时也会发布。由于此通知userInfo未被传递，而对象参数包含UIEvent与触摸相关的参数。

应用扩展

这里对这个功能不做详解.自行摸索.

自定义动画

SVProgressHUD提供了方法可以自定义图片.但是不支持gif格式，直接利用下面的方法依然显示一张静态的图片

[SVProgressHUD showImage:[UIImage imageNamed:@"loading.gif"] status:@"加载中..."];

我们可以把gif转化为一个动态的image.
下面是我在百度上搜的一个方法.仅供参考.

#import 

typedef void (^GIFimageBlock)(UIImage *GIFImage);
@interface UIImage (GIFImage)

/** 根据本地GIF图片名 获得GIF image对象 */
+ (UIImage *)imageWithGIFNamed:(NSString *)name;

/** 根据一个GIF图片的data数据 获得GIF image对象 */
+ (UIImage *)imageWithGIFData:(NSData *)data;

/** 根据一个GIF图片的URL 获得GIF image对象 */
+ (void)imageWithGIFUrl:(NSString *)url and:(GIFimageBlock)gifImageBlock;

下面是.m的方法实现.

#import "UIImage+GIFImage.h"
#import 
@implementation UIImage (GIFImage)
+ (UIImage *)imageWithGIFData:(NSData *)data{
    
    if (!data) return nil;
    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
    size_t count = CGImageSourceGetCount(source);
    UIImage *animatedImage;
    if (count <= 1) {
        animatedImage = [[UIImage alloc] initWithData:data];
    } else {
        NSMutableArray *images = [NSMutableArray array];
        NSTimeInterval duration = 0.0f;
        for (size_t i = 0; i < count; i++) {
            // 拿出了Gif的每一帧图片
            CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL); 
            //Learning... 设置动画时长 算出每一帧显示的时长(帧时长)
            NSTimeInterval frameDuration = [UIImage sd_frameDurationAtIndex:i source:source];
            duration += frameDuration;
            // 将每帧图片添加到数组中
            [images addObject:[UIImage imageWithCGImage:image scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp]];
            // 释放真图片对象
            CFRelease(image);
        }
        // 设置动画时长
        if (!duration) {
            duration = (1.0f / 10.0f) * count; 
        }
        animatedImage = [UIImage animatedImageWithImages:images duration:duration];
    }
    
    // 释放源Gif图片
    CFRelease(source);
    return animatedImage;
}
+ (UIImage *)imageWithGIFNamed:(NSString *)name{
    NSUInteger scale = (NSUInteger)[UIScreen mainScreen].scale;
    return [self GIFName:name scale:scale];
}

+ (UIImage *)GIFName:(NSString *)name scale:(NSUInteger)scale{
    NSString *imagePath = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%@@%zdx", name, scale] ofType:@"gif"];  
    if (!imagePath) {
        (scale + 1 > 3) ? (scale -= 1) : (scale += 1);
        imagePath = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%@@%zdx", name, scale] ofType:@"gif"];    
    }
    if (imagePath) {
        // 传入图片名(不包含@Nx)
        NSData *imageData = [NSData dataWithContentsOfFile:imagePath];
        return [UIImage imageWithGIFData:imageData];
    } else {
        imagePath = [[NSBundle mainBundle] pathForResource:name ofType:@"gif"];
        if (imagePath) { 
            // 传入的图片名已包含@Nx or 传入图片只有一张 不分@Nx
            NSData *imageData = [NSData dataWithContentsOfFile:imagePath];
            return [UIImage imageWithGIFData:imageData];
        } else {
            // 不是一张GIF图片(后缀不是gif)
            return [UIImage imageNamed:name];   
        }  
    }
}
+ (void)imageWithGIFUrl:(NSString *)url and:(GIFimageBlock)gifImageBlock{
    NSURL *GIFUrl = [NSURL URLWithString:url];
    if (!GIFUrl) return;
    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        NSData *CIFData = [NSData dataWithContentsOfURL:GIFUrl];
        // 刷新UI在主线程
        dispatch_async(dispatch_get_main_queue(), ^{
            gifImageBlock([UIImage imageWithGIFData:CIFData]);
        }); 
    });
}
#pragma mark - <关于GIF图片帧时长(Learning...)>
+ (float)sd_frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source {
    float frameDuration = 0.1f;
    CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil);
    NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties;
    NSDictionary *gifProperties = frameProperties[(NSString *)kCGImagePropertyGIFDictionary];
    NSNumber *delayTimeUnclampedProp = gifProperties[(NSString *)kCGImagePropertyGIFUnclampedDelayTime];
    if (delayTimeUnclampedProp) {
        frameDuration = [delayTimeUnclampedProp floatValue];
    } 
    else {
        NSNumber *delayTimeProp = gifProperties[(NSString *)kCGImagePropertyGIFDelayTime];
        if (delayTimeProp) {
            frameDuration = [delayTimeProp floatValue];
        }
    }
    // Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
    // We follow Firefox's behavior and use a duration of 100 ms for any frames that specify
    // a duration of <= 10 ms. See and
    // for more information.
    if (frameDuration < 0.011f) {
        frameDuration = 0.100f;
    }
    CFRelease(cfFrameProperties);
    return frameDuration;
}
@end

这个是UIimage的分类,在用到的控制器里面调用代码方法即可.这个分类实现我也不太懂.只会用.

   _imgView1.image = [UIImage imageWithGIFNamed:@"xuanxuan"];
    
    NSString *path = [[NSBundle mainBundle] pathForResource:@"xuanxuan" ofType:@"gif"];
    NSData *imgData = [NSData dataWithContentsOfFile:path];
    _imgView2.image = [UIImage imageWithGIFData:imgData];
    
    
    [UIImage imageWithGIFUrl:@"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1495708809771&di=da92fc5cf3bdd684711ab5124ee43183&imgtype=0&src=http%3A%2F%2Fimgsrc.baidu.com%2Fforum%2Fw%253D580%2Fsign%3D91bd6cd2d42a60595210e1121835342d%2F212eb9389b504fc215d0301ee6dde71190ef6d1a.jpg" and:^(UIImage *GIFImage) {
        _imgView3.image = GIFImage;
    }];

SVProgressHUD简单使用以及自定义动画

安装

使用

显示HUD

取消HUD

定制

样式

触觉反馈

通知

应用扩展

自定义动画

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