Object-C 中各数据类型转换 NSData NSMutableData NSString Byte UIImage 合并音频

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本文介绍iOS开发中常见的数据类型转换方法，包括NSString与NSData、NSData与Byte、NSData与UIImage之间的相互转换，并演示了如何使用NSData合并多个音频文件。

1，NSData 与 NSString

　NSData –> NSString

　　NSString *aString = [[NSString alloc] initWithData:adata encoding:NSUTF8StringEncoding];

　NSString –> NSData

　　NSString *aString = @"1234";
　　NSData *aData = [aString dataUsingEncoding: NSUTF8StringEncoding];

2，NSData 与 Byte
　　
NSData –> Byte

　　NSString *testString = @"1234567890";
　　NSData *testData = [testString dataUsingEncoding: NSUTF8StringEncoding];
　　Byte *testByte = (Byte *)[testData bytes];

　　
Byte –> NSData

　　Byte byte[] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23};
　　NSData *adata = [[NSData alloc] initWithBytes:byte length:24];

3，NSData 与 UIImage
　　

NSData –> UIImage

　　UIImage *aimage = [UIImage imageWithData: imageData];
　　//例：从本地文件沙盒中取图片并转换为NSData
　　NSString *path = [[NSBundle mainBundle] bundlePath];
　　NSString *name = [NSString stringWithFormat:@"ceshi.png"];
　　NSString *finalPath = [path stringByAppendingPathComponent:name];
　　NSData *imageData = [NSData dataWithContentsOfFile: finalPath];
　　UIImage *aimage = [UIImage imageWithData: imageData];

　UIImage－> NSData

　NSData *imageData = UIImagePNGRepresentation(aimae);

4，NSData 与 NSMutableData
　　

NSData --> MSMutableData
　　NSData *data=[[NSData alloc]init];
　[[NSMutableData alloc]initWithData:data];

5，合并音频


     //音频文件路径
         NSString *mp3Path1 = [[NSBundle mainBundle] pathForResource:@"1" ofType:@"mp3"];
         NSString *mp3Path2 = [[NSBundle mainBundle] pathForResource:@"2" ofType:@"mp3"];
         //音频数据
         NSData *sound1Data = [[NSData alloc] initWithContentsOfFile: mp3Path1];
         NSData *sound2Data = [[NSData alloc] initWithContentsOfFile: mp3Path2];
         //合并音频
         NSMutableData *sounds = [NSMutableData alloc];
         [sounds appendData:sound1Data];
         [sounds appendData:sound2Data];
         //保存音频

         NSLog(@"data length:%d", [sounds length]);

         [sounds writeToFile:[self filePathWithName:@"tmp.mp3"] atomically:YES];