touchesMoved＆lt; - 我只能看到y点

Question

为什么我只能看到nowPoint更改的“y”组件，[“x”组件始终为“0”] ??

- (void) touchesMoved: (NSSet *) touches withEvent: (UIEvent *) event {
    [super touchesMoved:touches withEvent:event];

    CGPoint nowPoint = [[touches anyObject] locationInView:self.view];
    CGPoint prevPoint = [[touches anyObject] previousLocationInView:self.view];

    NSLog(@"x %d,   y %d", nowPoint.x, nowPoint.y);
}

Answer 1

NSLog（@“x％d，y％d”，nowPoint.x，nowPoint.y）;

将此更改为...

NSLog(@"x %0.02f,   y %0.02f", nowPoint.x, nowPoint.y);