iOS base64 转 data ｜图片Base64转NSData ｜ UIImageView | UIImage

Api 接口返回 base64 图片字符串，需要显示在UIImageView 上。

假设 string类型的 base64ImageStr 为 api返回的 base64字符串

将base64字符串进行处理

//去除掉首尾的空白字符和换行字符
 NSString * img64 = [img stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
 //进行空字符串的处理
 img64 = [img64 stringByReplacingOccurrencesOfString:@"\r" withString:@""];
 //进行换行字符串的处理
 img64 = [img64 stringByReplacingOccurrencesOfString:@"\n" withString:@""];
            
 //进行字符串转data数据
 NSData * decodedImgData = [[NSData alloc] initWithBase64EncodedString:img64 options:NSDataBase64DecodingIgnoreUnknownCharacters];
            
//把data数据转换成图片内容
 weakSelf.picCodeImageView.image = [UIImage imageWithData:decodedImgData];

//去除掉首尾的空白字符和换行字符

NSString * img64 = base64ImageStr stringByTrimmingCharactersInSet:\[NSCharacterSet whitespaceAndNewlineCharacterSet];

//进行空字符串的处理

img64 = img64 stringByReplacingOccurrencesOfString:@"\\r" withString:@"";

//进行换行字符串的处理

img64 = img64 stringByReplacingOccurrencesOfString:@"\\n" withString:@"";

//进行字符串转data数据

NSData * decodedImgData = \[NSData alloc initWithBase64EncodedString:img64 options:NSDataBase64DecodingIgnoreUnknownCharacters];

//把data数据转换成图片内容

weakSelf.picCodeImageView.image = UIImage imageWithData:decodedImgData;