不管做什么语言开发,经常会进行数据转换,如string转byte,string转int,byte数组转string....... 在iOS中也不例外,现在把这些都搜集在一起,方便参考。
iOS NSString 和NSData 转换
NSString 转换成NSData 对象
NSData* xmlData = [@"testdata" dataUsingEncoding:NSUTF8StringEncoding];
NSData 转换成NSString对象
NSData * data;
NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSData 转换成char*
NSData *data;
char *test=[data bytes];
char* 转换成NSData对象
byte* tempData = malloc(sizeof(byte)*16);
NSData *content=[NSData dataWithBytes:tempData length:16];
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);
NSData 与 NSMutableData
NSData --> MSMutableData
NSData *data=[[NSData alloc]init];
NSMutableData *mdata=[[NSMutableData alloc]init];
mdata=[NSData dataWithData:data];
NSData合并为一个NSMutableData
- (NSString *)filePathWithName:(NSString *)filename
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:filename];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
//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];
[window makeKeyAndVisible];
return YES;
}
其他的转换函数
1、字符串拼接
NSString *newString = [NSString stringWithFormat:@"%@%@",tempA,tempB];
2、字符串转int
int intString = [newString intValue];
3、int转字符串
NSString *stringInt = [NSString stringWithFormat:@"%d",intString];
本文链接:https://it72.com/6528.htm