[英]iPhone/Cocoa Animation having effect I don't understand
我已經創建了一個基本的解鎖滑塊,就像您用來解鎖iPhone一樣。
在touchesEnded函數中,我使用動畫將滑塊移回原位。
用戶第一次移動滑塊(並且實際上並沒有將其解鎖),動畫效果很好,並且滑塊移回了原位。
但是,下一次用戶嘗試移動滑塊(並調用touchesMoved)時,滑塊被推到屏幕外(向左),移動量為之前滑動滑塊的量。
那么,發生了什么事?
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
self.dragging = NO;
self.startX = 0;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
self.unlock.frame = CGRectMake(0, 0, 75, 35);
[UIView commitAnimations];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if (!self.dragging ) { return; }
UITouch *touch = [[event allTouches] anyObject];
CGPoint point = [touch locationInView:self];
int offset = point.x - self.startX;
NSLog(@"%i", offset);
if (offset > (LENGTH-SIZE)) {
offset = (LENGTH-SIZE);
}
CGAffineTransform myTransform = CGAffineTransformMakeTranslation(offset, 0.0);
[self.unlock setTransform:myTransform];
if (point.x >= (LENGTH-(SIZE-self.startX))) {
NSLog(@"Slider reached end");
[self.sliderView removeFromSuperview];
}
}
編輯
這是工作功能,需要進行一些整理,盡管可能會更好(這要歸功於一對黑客回答了一對有關SO的問題)。 我將對整個模塊進行博客撰寫,因為似乎沒有標准的小部件:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if (!self.dragging ) { return; }
UITouch *touch = [[event allTouches] anyObject];
CGPoint point = [touch locationInView:self];
if (point.x >= (LENGTH-(SIZE-self.startX))) {
NSLog(@"Slider reached end");
[self.sliderView removeFromSuperview];
}
// offset based on where the user clicked the slider
int offset = point.x - self.startX;
if (offset > (LENGTH-SIZE)) {
offset = (LENGTH-SIZE);
}
//move the slider
CGRect oldFrame = self.unlock.frame;
CGRect newFrame = CGRectMake(self.frame.origin.x+offset, self.frame.origin.y-5, oldFrame.size.width, oldFrame.size.height);
self.unlock.frame = newFrame;
}
在上一個問題中,我沒有意識到您是通過更改其變形來移動滑塊的。 通過更改幀和變換來混合運動將變得相當復雜。
也許您可以嘗試做更多這樣的事情:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if (!self.dragging ) { return; }
UITouch *touch = [[event allTouches] anyObject];
CGPoint point = [touch locationInView:self];
int offset = point.x - self.startX;
NSLog(@"%i", offset);
if (offset > (LENGTH-SIZE)) {
offset = (LENGTH-SIZE);
}
CGRect oldFrame = self.frame;
CGRect newFrame = CGRectMake(oldFrame.origin.x+offset, oldFrame.origin.y, oldFrame.size.width, oldFrame.size.height);
self.frame = newFrame;
if (point.x >= (LENGTH-(SIZE-self.startX))) {
NSLog(@"Slider reached end");
[self.sliderView removeFromSuperview];
}
}
通過修改滑塊的框架(而不是平移)來移動滑塊,這應使滑塊與回彈動畫更好地交互。 或者,您可以在此處重置轉換,而不是在隱式動畫師中重置框架。
您需要在touchesEnded處理程序中重置視圖轉換:
[self.unlock setTransform:CGAffineTransformIdentity];
嘗試這樣做,而不是對frame
屬性設置動畫。
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