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我想比較兩個NSDates,一個是通過viewDidLoad方法創建的,另一個是通過單擊按鈕來創建的。我希望能夠點擊按鈕並查找自viewDidLoad運行以來的時差。我一直得到零的差異。有任何想法嗎?NSDate timeInterval = nil
#import "TimeViewController.h"
id startTime;
@implementation TimeViewController
- (void)viewDidLoad {
NSDate *startTime = [NSDate date];
NSLog(@"startTime = %@",startTime);
}
- (IBAction)buttonPressed{
NSDate *now = [NSDate date];
NSLog(@"now = %@",now);
double timeInterval = [now timeIntervalSinceDate:startTime];
NSLog(@"time difference = %@",[NSString stringWithFormat:@"%g",timeInterval]);
}