//联系人:石虎QQ: 1224614774昵称:嗡嘛呢叭咪哄

一、动态改变小数点个数

- (void)viewDidLoad {

[superviewDidLoad];

NSInteger pointNum =7;

CGFloat num =3.23323000000;

NSString *string = [NSString stringWithFormat:@"%%.%ldf",pointNum];

NSString *str = [NSString stringWithFormat:string, num];

NSLog(@"str %@", str);

}

打印结果:2017-09-17 00:07:49.487 dddd[99756:2847097]str 3.2332300

二、效果图:

图1:

图2:

谢谢!!!