将PinchRecognizer Objective-C代码转换为Swift [英] Convert PinchRecognizer Objective-C code to Swift
本文介绍了将PinchRecognizer Objective-C代码转换为Swift的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试将Objective-C代码转换为Swift,有人可以帮忙吗?我被困在一条线上.
I am trying to translate the Objective-C code to Swift, can someone help. I am stuck on one line.
Objective-C
-(void)pinchDetected:(UIPinchGestureRecognizer *)pinchRecognizer
{
if([pinchRecognizer state] == UIGestureRecognizerStateBegan) {
// Reset the last scale, necessary if there are multiple objects with different scales
lastScale = [pinchRecognizer scale];
}
if ([pinchRecognizer state] == UIGestureRecognizerStateBegan ||[pinchRecognizer state] == UIGestureRecognizerStateChanged)
{
###I NEED TO CONVERT THIS LINE
CGFloat currentScale = [[[pinchRecognizer view].layer valueForKeyPath:@"transform.scale"] floatValue];
const CGFloat maxScale = 1.5;
const CGFloat minScale = 1.0;
CGFloat newScale = 1 - (lastScale - [pinchRecognizer scale]);
newScale = MIN(newScale, maxScale / currentScale);
newScale = MAX(newScale, minScale / currentScale);
thePageViewController.view.transform = CGAffineTransformScale(thePageViewController.view.transform, newScale, newScale);
lastScale = [pinchRecognizer scale]; // Store the previous scale factor for the next pinch gesture call
}
}
快速
func pinchDetected(pinchRecognizer: UIPinchGestureRecognizer) {
var lastScale = pinchRecognizer.scale
if(pinchRecognizer.state == UIGestureRecognizerState.Began) {
// Reset the last scale, necessary if there are multiple objects with different scales
lastScale = pinchRecognizer.scale
}
if (pinchRecognizer.state == UIGestureRecognizerState.Began || pinchRecognizer.state == UIGestureRecognizerState.Changed)
{
###HOW DO I CONVERT THIS LINE TO SWIFT?
var currentScale: CGFloat = [[[pinchRecognizer.view].layer valueForKeyPath:@"transform.scale"] floatValue];
let maxScale: CGFloat = 1.5;
let minScale: CGFloat = 1.0;
var newScale: CGFloat = 1 - (lastScale - pinchRecognizer.scale)
newScale = min(newScale, maxScale / currentScale);
newScale = max(newScale, minScale / currentScale);
self.view.transform = CGAffineTransformScale(self.view.transform, newScale, newScale);
lastScale = pinchRecognizer.scale // Store the previous scale factor for the next pinch gesture call
}
}
推荐答案
您提到的要转换的行可以这样完成.这对我有用.
The Line you mentioned to convert can be done like this. This worked for me.
var curScale = pinchRecognizer.view!.layer.valueForKeyPath("transform.scale")!.floatValue
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