Objective-C 中字符串与数字的互换

NSString *newString = @"123";

1、字符串转int
int intString = [newString intValue];

2、int转字符串
NSString *stringInt = [NSString stringWithFormat:@"%d",intString];

3、字符串转float
 float floatString = [ newString floatValue];

6、float转字符串
NSString *stringFloat = [NSString stringWithFormat:@"%f",intString];