我目前无法通过点击UIBarButtonItem来禁用/启用平移手势。目前我理解它的简单代码，但由于某种原因，代码没有被读取。到目前为止，这是我的代码：
- (IBAction)saveButton:(UIBarButtonItem*)saveRep {
buttonCount ++;
if (buttonCount > 0) {
UIPanGestureRecognizer *panner = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panWasRecognized:)];
for (_buttonField in self.view.subviews) {
panner.enabled=NO;
}
}
}
- (IBAction)editButton:(UIBarButtonItem*)editRep {
buttonCount ++;
if (buttonCount > 0) {
UIPanGestureRecognizer *panner = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panWasRecognized:)];
_draggedView = panner.view;
for (_buttonField in self.view.subviews) {
panner.enabled = YES;
}
}
}
当我点击saveButton时，我希望禁用panner，我已使用panner.enabled=NO;设置了但是，此代码无效！按下保存按钮后，平移器仍处于启用状态并正常工作。
然后我想点击editButton再次启用panner，我试图用panner.enable=YES;
最初我将这个平移手势识别器添加到我点击我的addRepButton时创建的UIButton。这是我的整套代码供参考：
@implementation FieldGoalChartViewController
{
}
-(void)viewDidLoad{
[super viewDidLoad];
}
-(void) viewWillAppear:(BOOL)animated
{
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event {
UITouch *aTouch = [touches anyObject];
CGRect buttonRect = self.buttonField.frame;
CGPoint point = [aTouch locationInView:self.buttonField.superview];
if (!CGRectContainsPoint(buttonRect, point)) {
_buttonField.layer.borderColor = [UIColor blackColor].CGColor;
_draggedView.layer.borderColor = [UIColor blackColor].CGColor;
for (_buttonField in self.view.subviews) {
_buttonField.layer.borderColor = [UIColor blackColor].CGColor;
}
}
}
- (void)longPress:(UILongPressGestureRecognizer*)gesture {
if ( gesture.state == UIGestureRecognizerStateBegan ) {
gesture.view.layer.borderColor = [UIColor whiteColor].CGColor;
UIAlertController * alert= [UIAlertController
alertControllerWithTitle:@"Would you like to delete the selected rep(s)?"
message:nil
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* deleteButton = [UIAlertAction
actionWithTitle:@"Delete"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
for (_buttonField in self.view.subviews) {
if ([[UIColor colorWithCGColor:_buttonField.layer.borderColor] isEqual:[UIColor whiteColor]]) {
[_buttonField removeFromSuperview];
}
}
[alert dismissViewControllerAnimated:YES completion:nil];
}];
UIAlertAction* cancelButton = [UIAlertAction
actionWithTitle:@"Cancel"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
[alert dismissViewControllerAnimated:YES completion:nil];
}];
[alert addAction:deleteButton];
[alert addAction:cancelButton];
[self presentViewController:alert animated:YES completion:nil];
}
}
- (void)panWasRecognized:(UIPanGestureRecognizer *)panner {
{
panner.view.layer.borderColor = [UIColor whiteColor].CGColor;
_draggedView = panner.view;
CGPoint offset = [panner translationInView:_draggedView.superview];
CGPoint center = _draggedView.center;
_draggedView.center = CGPointMake(center.x + offset.x, center.y + offset.y);
_draggedView.layer.masksToBounds =YES;
_buttonField.layer.borderWidth = 3.0f;
// Reset translation to zero so on the next `panWasRecognized:` message, the
// translation will just be the additional movement of the touch since now.
[panner setTranslation:CGPointZero inView:_draggedView.superview];
}
}
-(void)buttonTouched:(UIButton*)sender forEvent:(id)tap {
NSSet *touches = [tap allTouches];
UITouch *touch = [touches anyObject];
touch.view.layer.borderColor = [UIColor whiteColor
].CGColor;
}
-(void)doubleTapped:(UIButton*)sender forEvent:(id)twoTaps {
NSSet *touches = [twoTaps allTouches];
UITouch *touch = [touches anyObject];
touch.view.layer.borderColor = [UIColor blackColor].CGColor;
}
- (IBAction)saveButton:(UIBarButtonItem*)saveRep {
buttonCount ++;
if (buttonCount > 0) {
for (_buttonField in self.view.subviews) {
UIPanGestureRecognizer *panner = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panWasRecognized:)];
panner.enabled=NO;
}
}
}
- (IBAction)editButton:(UIBarButtonItem*)editRep {
buttonCount ++;
if (buttonCount > 0) {
UIPanGestureRecognizer *panner = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panWasRecognized:)];
_draggedView = panner.view;
for (_buttonField in self.view.subviews) {
panner.enabled = YES;
}
}
}
- (IBAction)addRepButton:(UIBarButtonItem *)newRep {
self.labelCounter++;
buttonCount ++;
if (buttonCount > 0 )
{
_buttonField = [[UIButton alloc]initWithFrame:CGRectMake(300, 300, 28, 28)];
[_buttonField setTitle:[NSString stringWithFormat:@"%i", self.labelCounter]forState:UIControlStateNormal];
[_buttonField setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
_buttonField.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
_buttonField.userInteractionEnabled = YES;
_buttonField.layer.cornerRadius = 14;
_buttonField.layer.borderColor = [UIColor blackColor].CGColor;
_buttonField.layer.borderWidth = 3.0f;
_buttonField.titleLabel.font = [UIFont boldSystemFontOfSize:13];
[_buttonField setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
_buttonField.layer.backgroundColor = [UIColor blackColor].CGColor;
_buttonField.layer.masksToBounds = YES;
//Pan gesture declared in button
UIPanGestureRecognizer *panner = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panWasRecognized:)];
[_buttonField addGestureRecognizer:panner];
//Long Press gesture declared in button
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
[self.buttonField addGestureRecognizer:longPress];
//Touch down inside declared in button
[self.buttonField addTarget:self action:@selector(buttonTouched:forEvent:) forControlEvents:UIControlEventTouchDown];
//Double Tap inside declared in button
[self.buttonField addTarget:self action:@selector(doubleTapped:forEvent:) forControlEvents:UIControlEventTouchDownRepeat];
[self.view addSubview:(_buttonField)];
}
}
@end
我希望了解为什么我的UIPanGestureRecognizer在被调用时没有被启用/禁用。