获取NSNumber的前3位数字

Question

float distance = 2347293874923;
NSNumber * dist = [NSNumber numberWithFloat:distance];

如何在NSString中仅获取dist的前3位数字。

Answer 1

试试这个：

float distance = 2347293874923;
NSString * n = [NSString stringWithFormat:@"%f", distance];
NSString * s = [n substringToIndex:3];

NSLog(@"%@", s);