字典型转换为JSON数据

一）将NSDictionary转换成为NSData类型

NSDictionary *tempDict=[[NSDictionary alloc] initWithObjectsAndKeys:@"nihao",@"sayHeiio", @"woshizhu",@"geyan",nil];

NSData *jsonData=[self  toJSONData:tempDict];

二）将NSData类型转换为Json

NSString *jsonString= [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

三）将转换后存在的换行符替换掉（或者删除掉）

jsonString = [jsonString stringByReplacingOccurrencesOfString:@"\n" withString:@""];

删除特定字符

-(NSString *) stringDeleteString:(NSString *)str

{

NSMutableString *str1 = [NSMutableString stringWithString:str];

for (int i = 0; i < str1.length; i++) {

unichar c = [str1 characterAtIndex:i];

NSRange range = NSMakeRange(i, 1);

if (c == '\n') { //此处可以是任何字符

[str1 deleteCharactersInRange:range];

--i;

}

}

NSString *newstr = [NSString stringWithString:str1];

return newstr;

}

转换成为NSData

-(NSData *)toJSONData:(id)theData {

NSError *error = nil;

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:theData

options:NSJSONWritingPrettyPrinted

error:&error];

if ([jsonData length] > 0 && error == nil){

return jsonData;

}else{

return nil;

}

}