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后台返回json|后台返回json 包含\n 解决办法
//后台不愿意给你解决的话 用此方法
NSString * str = [[NSString alloc]initWithData:json encoding:NSUTF8StringEncoding];
NSString * str2 = [str stringByReplacingOccurrencesOfString:@"\t" withString:@"\\t"];
str2 = [str2 stringByReplacingOccurrencesOfString:@"\n" withString:@"\\n"];
str2 = [str2 stringByReplacingOccurrencesOfString:@"\r" withString:@"\\r"];
NSArray *dataArray = [NSJSONSerialization JSONObjectWithData:[str2 dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:nil];
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