NSNumber转NSString
NSString *A = [[NSString alloc] init];
NSNumber *B = [NSNumber numberWithInt:123456];
A = [NSString stringWithFormat:@"%@",B];
NSString转NSNumber
NSString *A = @"890909";
NSNumber *B = @([A integerValue]);
NSString转int
NSString *A = @"123456";
int B = [A intValue];
int转NSString
int B = 123;
NSString *A = [NSString stringWithFormat:@"%d",B];
NSString转NSData
NSData *A = [@"textString" dataUsingEncoding:NSUTF8StringEncoding];
NSData转NSString
NSData *A;
NSString *B=[[NSString alloc] initWithData:A encoding:NSUTF8StringEncoding];
NSString转NSDate(日期类,不是NSData)
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *A = @"2017-06-03 11:20:05";
NSDate *date = [dateFormatter dateFromString:A];
NSDate转NSString
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *B = [NSDate date];//系统现在的时间
NSString *A = [dateFormatter stringFromDate:B];
NSRange转NSValue
- 开发中可能需要将range存进数组中或者字典中，此时需要把NSRange(结构体)转成NSObject对象
NSRange range = NSMakeRange(1,1);
NSValue *value = [NSValue valueWithRange:range];
NSValue转NSRange
NSRange range = [value rangeValue];
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