一：Nsstring和NSURL 转换
//Nsstring->NSURL Nsstring *urlString=[@"http://www.Google.com" stringByAddingPercentEscapesUsingEnCoding:NSUTF8StringEnCoding]; NSURL *url=[NSURL URLWithString:urlString]; //NSURL->Nsstring Nsstring *urlString=[[url absoluteString] stringByReplacingPercentEscapesUsingEnCoding:NSUTF8StringEnCoding];
二：Nsstring和NSData转换（即可作Json串互相转换）
//NSData－> Nsstring Nsstring *testString = [[Nsstring alloc] initWithData:testData enCoding:NSUTF8StringEnCoding]; //Nsstring－>NSData Nsstring *aString = @"我是Nsstring"; NSData *testData = [testString dataUsingEnCoding: NSUTF8StringEnCoding];
三：NSData和NSImage转换
[cpp] view plain copy print ? //NSData－>UIImage UIImage *testimage = [UIImage imageWithData: imageData]; //UIImage->NSData NSData *imageData = UIImagePNGRepresentation(testimage) //或者 NSData *imageData = UIImageJPEGRepresentation(testimage,1.0)
四：NSData和NSDictionary转换
[cpp] view plain copy print ? //NSData-->NSDictionary NSDictionary *testDict = [NSJsONSerialization JsONObjectWithData:testData options:NSJsONReadingMutableContainers error:nil] //或者 NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:testData]; NSDictionary *myDictionary = [[unarchiver decodeObjectForKey:@"Some Key Value"] retain]; [unarchiver finishDeCoding]; //NSDictionay --> NSData NSMutableData *data = [[NSMutableData alloc] init]; NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data]; [archiver encodeObject:params forKey:@"Some Key Value"]; [archiver finishEnCoding];
五：NSDictionary和JsON转换
//NSDictionary -> JsON: //这个方法是SBJson类库里的，需要导入SBJson.h Nsstring *JsonStr=[dict JsONRepresentation]; //建议（特别是http取回来的JsonStr转换如下） //JsON->NSDictionary: NSData *JsonData = [testJsonStr dataUsingEnCoding:NSUTF8StringEnCoding]; NSDictionary *dict = [NSJsONSerialization JsONObjectWithData:JsonData options:NSJsONReadingMutableContainers error:nil]
//摘录其他同学的
NSData 与 Byte
NSData－> Byte数组
Nsstring *testString = @"1234567890";
NSData *testData = [testString dataUsingEnCoding: NSUTF8StringEnCoding];
Byte *testByte = (Byte *)[testData bytes];
for(int i=0;i<[testData length];i++)
printf("testByte = %d\n",testByte[i]);
Byte数组－> 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];
Byte数组－>16进制数
Byte *bytes = (Byte *)[aData bytes];
Nsstring *hexStr=@"";
for(int i=0;i<[encryData length];i++)
{
Nsstring *newHexStr = [Nsstring stringWithFormat:@"%x",bytes[i]&0xff]; ///16进制数
if([newHexStr length]==1)
hexStr = [Nsstring stringWithFormat:@"%@0%@",hexStr,newHexStr];
else
hexStr = [Nsstring stringWithFormat:@"%@%@",newHexStr];
}
NSLog(@"bytes 的16进制数为:%@",hexStr);
16进制数－>Byte数组
///// 将16进制数据转化成Byte 数组
Nsstring *hexString = @"3e435fab9c34891f"; //16进制字符串
int j=0;
Byte bytes[128];
///3ds key的Byte 数组， 128位for(int i=0;i<[hexString length];i++){int int_ch; /// 两位16进制数转化后的10进制数 unichar hex_char1 = [hexString characteratIndex:i]; ////两位16进制数中的第一位(高位*16)int int_ch1;if(hex_char1 >= '0' && hex_char1 <='9')int_ch1 = (hex_char1-48)*16; //// 0 的Ascll - 48else if(hex_char1 >= 'A' && hex_char1 <='F')int_ch1 = (hex_char1-55)*16; //// A 的Ascll - 65elseint_ch1 = (hex_char1-87)*16; //// a 的Ascll - 97i++; unichar hex_char2 = [hexString characteratIndex:i]; ///两位16进制数中的第二位(低位)int int_ch2;if(hex_char2 >= '0' && hex_char2 <='9')int_ch2 = (hex_char2-48); //// 0 的Ascll - 48else if(hex_char1 >= 'A' && hex_char1 <='F')int_ch2 = hex_char2-55; //// A 的Ascll - 65elseint_ch2 = hex_char2-87; //// a 的Ascll - 97 int_ch = int_ch1+int_ch2;NSLog(@"int_ch=%d",int_ch);bytes[j] = int_ch; ///将转化后的数放入Byte数组里j++;}NSData *newData = [[NSData alloc] initWithBytes:bytes length:128];NSLog(@"newData=%@",newData); 总结
以上是内存溢出为你收集整理的NSData，NSImage,NSDictionary,NSString，NSInteger，Float，NSURL 等等互相转换全部内容，希望文章能够帮你解决NSData，NSImage,NSDictionary,NSString，NSInteger，Float，NSURL 等等互相转换所遇到的程序开发问题。
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