我有一些NSData是 Base-64 编码的，我想解码它，我看过一个看起来像这样的例子
NSData* myPNGData = [xmlString dataUsingEncoding:NSUTF8StringEncoding];
[Base64 initialize];
NSData *data = [Base64 decode:img];
cell.image.image = [UIImage imageWithData:myPNGData];
但是，这给了我很多错误，我想知道该怎么做才能使其正常工作。我需要将某种类型的文件导入到我的项目中还是必须包含框架？
这些是我得到的错误
Use of undeclared identifier 'Base64'
Use of undeclared identifier 'Base64'
Use of undeclared identifier 'cell'
我到处寻找，无法弄清楚什么是正确的做法。
您可以将 Base64 编码的字符串解码为NSData：
-(NSData *)dataFromBase64EncodedString:(NSString *)string{
if (string.length > 0) {
//the iPhone has base 64 decoding built in but not obviously. The trick is to
//create a data url that's base 64 encoded and ask an NSData to load it.
NSString *data64URLString = [NSString stringWithFormat:@"data:;base64,%@", string];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:data64URLString]];
return data;
}
return nil;
}
使用上述方法从 Base64 字符串中获取图像的示例：
-(void)imageFromBase64EncodedString{
NSString *string = @""; // replace with encocded string
NSData *imageData = [self dataFromBase64EncodedString:string];
UIImage *myImage = [UIImage imageWithData:imageData];
// do something with image
}
NSData Base64 库文件将为您提供帮助。
#import "NSData+Base64.h"
//Data from your string is decoded & converted to UIImage
UIImage *image = [UIImage imageWithData:[NSData
dataFromBase64String:strData]];
希望能帮助到你
斯威夫特 3 版本
几乎一样
//Create your NSData object
let data = NSData(base64Encoded: "yourStringData", options: NSData.Base64DecodingOptions.ignoreUnknownCharacters)
//And then just create a new image based on the data object
let image = UIImage(data: data as! Data)
斯威夫特 2.3 版本
//Create your NSData object
let data = NSData(base64EncodedString: "yourStringData", options: .IgnoreUnknownCharacters)
//And then just create a new image based on the data object
let image = UIImage(data: data!)
//retrieve your string
NSString *string64 = //... some string base 64 encoded
//convert your string to data
NSData *data = [[NSData alloc] initWithBase64EncodedString:string64 options:NSDataBase64DecodingIgnoreUnknownCharacters];
//initiate image from data
UIImage *captcha_image = [[UIImage alloc] initWithData:data];
NSString *base64String=@"............";
NSData* data = [[NSData alloc] initWithBase64EncodedString:base64String options:0];
UIImage* img = [UIImage imageWithData:data];
//imageview is the refrence outlet of image view
self.imageview.image=img;
这适用于 ios7 及更高版本。
- (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {
NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];
return [UIImage imageWithData:data];
}
并使用这样的代码：
UIImage *img = [self decodeBase64ToImage:<ur base64 string>];
使用类型 Data 而不是 NSData
let data = Data(base64Encoded: imageBase64String, options: Data.Base64DecodingOptions.ignoreUnknownCharacters)
let image = UIImage(data:data!)