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

本文主要是介绍Object-C 中各数据类型转换 NSData NSMutableData NSString Byte UIImage 合并音频，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1，NSData 与 NSString

　NSData –> NSString

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

　　NSString *aString = @"1234";NSData *aData = [aString dataUsingEncoding: NSUTF8StringEncoding];
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2，NSData 与 Byte 
　　 
NSData –> Byte

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

　NSData *imageData = UIImagePNGRepresentation(aimae);
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4，NSData 与 NSMutableData 
　　

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

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