ios怎样在imageView实现动画

在ios教程中有很多种办法能够为imageView添加图片实现动画，专门整理了本篇为imageView添加图片实现动画的总结，希望能帮助到大家。 //为图片设置动态self.imageView.animationImages = animateArray //为动画设置持续时间self.imageView.animationDuration = 3.0//创建imageViewself.imageView = [[UIImageViewalloc]initWithFrame:CGRectMake(0, 40, 320, 260)]//把图片添加到动态数组NSMutableArray * animateArray = [[NSMutableArrayalloc]initWithCapacity:20] [animateArray addObject:[UIImage imageNamed:@"t1.png"]] [animateArray addObject:[UIImage imageNamed:@"t2.png"]] [animateArray addObject:[UIImage imageNamed:@"t3.png"]] [animateArray addObject:[UIImage imageNamed:@"t4.png"]] [animateArray addObject:[UIImage imageNamed:@"t5.png"]] [animateArray addObject:[UIImage imageNamed:@"t6.png"]] [animateArray addObject:[UIImage imageNamed:@"t7.png"]] [animateArray addObject:[UIImage imageNamed:@"t8.png"]] [animateArray addObject:[UIImage imageNamed:@"t9.png"]] [animateArray addObject:[UIImage imageNamed:@"t10.png"]] [animateArray addObject:[UIImage imageNamed:@"t11.png"]] [animateArray addObject:[UIImage imageNamed:@"t12.png"]] [animateArray addObject:[UIImage imageNamed:@"t13.png"]] [animateArray addObject:[UIImage imageNamed:@"t14.png"]] [animateArray addObject:[UIImage imageNamed:@"t15.png"]] [animateArray addObject:[UIImage imageNamed:@"t16.png"]] [animateArray addObject:[UIImage imageNamed:@"t17.png"]] [animateArray addObject:[UIImage imageNamed:@"t18.png"]] [animateArray addObject:[UIImage imageNamed:@"t19.png"]] [animateArray addObject:[UIImage imageNamed:@"t20.png"]] //开始播放动画 [self.imageView startAnimating]//为默认的无限循环self.imageView.animationRepeatCount = 0 [self.view addSubview:self.imageView]

iOS系统提供的UIImageView控件是不支持GIF的加载的，在APP开发中会使用到一些GIF图片，本文主要讲解苹果手机上GIF图使用方法，主要是基于SDWebImage框架。

一、界面显示：

1.先集成SDWebImage及SDWebImage/GIF框架

pod 'SDWebImage'

pod 'SDWebImage/GIF'

2.使用SDWebImage/GIF框架提供的兼容GIF图的控件FLAnimatedImageView

初始化

        _img = [[FLAnimatedImageView alloc] init]

        _img.contentMode = UIViewContentModeScaleAspectFill

        _img.clipsToBounds = YES

        _img.backgroundColor = ColorViewBack

        [self.contentView addSubview:_img]

        [_img makeConstraints:^(MASConstraintMaker *make) {

            make.left.right.top.bottom.equalTo(self)

        }]

加载GIF图

   [_img sd_setImageWithURL:[NSUrl urlWithStrint:@"httpxxxxxxx"]] 

该控件的使用方法与系统的UIImageView一样。

二、上传

上传方法可以分为Base64和file方法，本文主要介绍Base 64方法

//图片文件转化成Base64字符

+(NSString *)getGifBase64Str:(NSData *)data

{

    NSString *imageStyle = [self getImageStyle:data]

    NSString *str = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength]

    str = [NSString stringWithFormat:@"data:image/%@base64,%@", imageStyle, str]

    return str

}

//获取图片的格式

+(NSString *)getImageStyle:(NSData *)data

{

    uint8_t c

    [data getBytes:&c length:1]

    switch (c) {

        case 0xFF:

            return @"jpeg"

        case 0x89:

            return @"png"

        case 0x47:

            return @"gif"

        case 0x49:

        case 0x4D:

            return @"tiff"

        case 0x52:

            if ([data length] <12) {

                return nil

            }

            NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding]

            if ([testString hasPrefix:@"RIFF"] &&[testString hasSuffix:@"WEBP"]) {

                return @"webp"

            }

            return nil

    }

    return nil

}

把这个转化后的Base64字符串，当成一个网络请求的参数，发起请求即可(要有post请求，Base64字符长度较大，get请求不支持)

三、保存到相册

NSData *gifData = [NSData dataWithContentsOfURL:[NSURL URLWithString:url] options:NSDataReadingUncached error:nil]

    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]

    NSDictionary *metadata = @{@"UTI":(__bridge NSString *)kUTTypeGIF}

    [library writeImageDataToSavedPhotosAlbum:gifData metadata:metadata completionBlock:^(NSURL *assetURL, NSError *error) {

        [self showAlert:@"保存成功" type:AlertViewType_Toast]

    }]

原文链接：https://blog.csdn.net/qq_30356665/java/article/details/88054049

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