我想用Xcode计算这个操作:
A * B *(天)= R
DAYS =从过去的datepicker到今天的天数。
今天是iPhone的日期设置。例如:
5 * 5 * 10
10 =昨天和今天之间的天数。
这是我的情况:
我的H. @interface ViewController:UIViewController@property (strong, nonatomic) IBOutlet UITextField *a;
@property (strong, nonatomic) IBOutlet UITextField *b;
@property (strong, nonatomic) IBOutlet UILabel *r;
@property (strong, nonatomic) IBOutlet UIButton *result;
@property (strong, nonatomic) IBOutlet UIDatePicker *data;
@end
我的M
- (IBAction)calculate:(id)sender {
NSDate *past = _data.date ;
NSDate *now =[NSString stringWithFormat:@"%@",nil];
**float z = HOW MANY DAYS BETWEEN PICKER AND TODAY;** //this is a example
float a = ([a.text floatValue]);
float b = a*([b.text floatValue]);
float r= a*b*(z.text float);
_result.text = [[NSString alloc]initWithFormat:@"%2.f",b];
}
我知道这是错误的方法....你能帮助我吗?
答案 0 :(得分:1)
您计算的天数,因此您可以使用int
代替float
。
NSDate *past = _data.date ;
NSDate *now = [NSDate date];
NSCalendar *gregorianCalendar = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSUInteger unitFlags = NSDayCalendarUnit;
NSDateComponents *components = [gregorianCalendar components:unitFlags
fromDate:past
toDate:now
options:0];
z = [components day];
int a = a.text.intValue;
int b = a * b.text.intValue;
int r = a * b * z;
_result.text = [[NSString alloc] initWithFormat:@"%d", r];