zs = MAX(zs, 0.1);

　　zs = MIN(zs, 5.0);

　　[UIView beginAnimations:nil context:NULL];

　　[UIView setAnimationDuration:0.3];

　　scrollView.zoomScale = zs;

　　[UIView commitAnimations];

　　}

　　#pragma mark -

　　#pragma mark === UITouch Delegate ===

　　#pragma mark -

　　- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

　　{

　　//NSLog(@"%s", _cmd);

　　UITouch *touch = [touches anyObject];

　　if ([touch tapCount] == 2)

　　{

　　//NSLog(@"double click");

　　CGFloat zs = self.zoomScale;

　　zs = (zs == 1.0) ? 2.0 : 1.0;

　　[UIView beginAnimations:nil context:NULL];

　　[UIView setAnimationDuration:0.3];

　　self.zoomScale = zs;

　　[UIView commitAnimations];

　　}

　　}