我试图通过调用它来关闭另一个方法中的一个方法的UIView，UIView可以很好地关闭，但要等到当前方法中的所有过程都完成后才能关闭。
我想知道是否有一种方法可以强制首先发生第一件事（即关闭UIviews），然后继续当前方法？
这就是我的方法
- (void)selectDeselectAllPressed:(UIButton*)button {
int id = button.tag;
[SVProgressHUD showWithStatus:@"Updating" maskType:SVProgressHUDMaskTypeGradient];
[self displaySelected]; // removes current view so you can load hud will not be behind it
if (id == 1) {
[self selectAllD];
} else if (id == 2) {
[self deselectAllD];
} else if (id == 3) {
[self selectAllI];
} else if (id == 4) {
[self deselectAllI];
}
}
如您所见，按下按钮时会调用此方法，我想让displaySelected方法在调用任何其他方法之前执行所需的操作吗？
目前，当我调试它时，displaySelected方法发生了什么事情，它被称为线程遍历，然后继续执行if语句，然后在if语句中的方法完成后，对displaySelected进行更改。
任何帮助将不胜感激。
更新：这是我正在调用的方法，有一个if语句检查视图是否为nil，然后加载该视图，否则将其卸载。在点n处加载了我在视图上的代码，因此当我从selectDeselectAllPressed调用它时，将其输入else如果是关闭视图的方法的一部分。.我已调试，并看到线程进入此点
- (void) displaySelected {
if (allBackGroundView == nil) {
// load view
CGFloat fullHeight = [UIScreen mainScreen].bounds.size.height;
CGFloat fullWidth = [UIScreen mainScreen].bounds.size.width;
// draw background
background = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, fullHeight, fullWidth)];
background.backgroundColor = [UIColor blackColor];
background.alpha = 0.6;
[self.view addSubview:background];
UITapGestureRecognizer *gestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(displaySelectedI)];
gestureRecognizer.cancelsTouchesInView = NO;
[background addGestureRecognizer:gestureRecognizer];
allBackGroundView = [[UIView alloc] initWithFrame:CGRectMake(762.0, 43.0, 250.0, 220.0)];
allBackGroundView.backgroundColor = [UIColor lightGrayColor];
allBackGroundView.layer.borderWidth = 0.5;
allBackGroundView.layer.borderColor = [UIColor darkGrayColor].CGColor;
[self.view addSubview:allBackGroundView];
// set labeltitles
selecteAllDFitLabel = [[UILabel alloc] initWithFrame:CGRectMake(10.0, 18.0, 200.0, 30.0)];
selecteAllDFitLabel.backgroundColor = [UIColor clearColor];
selecteAllDFitLabel.font = [UIFont boldSystemFontOfSize:16];
selecteAllDFitLabel.textColor = [UIColor whiteColor];
selecteAllDFitLabel.text = @"Select all Dfit:";
[allBackGroundView addSubview:selecteAllDFitLabel];
deselecteAllDFitLabel = [[UILabel alloc] initWithFrame:CGRectMake(10.0, 65.0, 200.0, 30.0)];
deselecteAllDFitLabel.backgroundColor = [UIColor clearColor];
deselecteAllDFitLabel.font = [UIFont boldSystemFontOfSize:16];
deselecteAllDFitLabel.textColor = [UIColor whiteColor];
deselecteAllDFitLabel.text = @"Deselect all Dfit:";
[allBackGroundView addSubview:deselecteAllDFitLabel];
selecteAllILabel = [[UILabel alloc] initWithFrame:CGRectMake(10.0, 120.0, 200.0, 30.0)];
selecteAllILabel.backgroundColor = [UIColor clearColor];
selecteAllILabel.font = [UIFont boldSystemFontOfSize:16];
selecteAllILabel.textColor = [UIColor whiteColor];
selecteAllILabel.text = @"Select all I:";
[allBackGroundView addSubview:selecteAllILabel];
deselecteAllILabel = [[UILabel alloc] initWithFrame:CGRectMake(10.0, 170.0, 200.0, 30.0)];
deselecteAllILabel.backgroundColor = [UIColor clearColor];
deselecteAllILabel.font = [UIFont boldSystemFontOfSize:16];
deselecteAllILabel.textColor = [UIColor whiteColor];
deselecteAllILabel.text = @"Deselect all I:";
[allBackGroundView addSubview:deselecteAllILabel];
UIImage* okImage = [UIImage imageNamed:@"OK.png"];
UIImage* noImage = [UIImage imageNamed:@"No.png"];
selecteAllDFitButton =[UIButton buttonWithType:UIButtonTypeCustom];
selecteAllDFitButton.tag = 1; // so I know what action to perform when i call selectDeselectAllPressed
[selecteAllDFitButton addTarget:self
action:@selector(selectDeselectAllPressed:)
forControlEvents:UIControlEventTouchUpInside];
selecteAllDFitButton.frame = CGRectMake(200.0, 12.0, 40.0, 40.0);
[selecteAllDFitButton setImage:okImage forState:UIControlStateNormal];
[allBackGroundView addSubview:selecteAllDFitButton];
deselecteAllDFitButton =[UIButton buttonWithType:UIButtonTypeCustom];
deselecteAllDFitButton.tag = 2;
[deselecteAllDFitButton addTarget:self
action:@selector(selectDeselectAllPressed:)
forControlEvents:UIControlEventTouchUpInside];
deselecteAllDFitButton.frame = CGRectMake(200.0, 62.0, 40.0, 40.0);
[deselecteAllDFitButton setImage:noImage forState:UIControlStateNormal];
[allBackGroundView addSubview:deselecteAllDFitButton];
selecteAllIButton =[UIButton buttonWithType:UIButtonTypeCustom];
selecteAllIButton.tag = 3;
[selecteAllIButton addTarget:self
action:@selector(selectDeselectAllPressed:)
forControlEvents:UIControlEventTouchUpInside];
selecteAllIButton.frame = CGRectMake(200.0, 112.0, 40.0, 40.0);
[selecteAllIButton setImage:okImage forState:UIControlStateNormal];
[allBackGroundView addSubview:selecteAllIButton];
deselecteAllIButton =[UIButton buttonWithType:UIButtonTypeCustom];
deselecteAllIButton.tag = 4;
[deselecteAllIButton addTarget:self
action:@selector(selectDeselectAllPressed:)
forControlEvents:UIControlEventTouchUpInside];
deselecteAllIButton.frame = CGRectMake(200.0, 162.0, 40.0, 40.0);
[deselecteAllIButton setImage:noImage forState:UIControlStateNormal];
[allBackGroundView addSubview:deselecteAllIButton];
}
else {
[allBackGroundView removeFromSuperview];
[background removeFromSuperview];
allBackGroundView = nil;
background = nil;
}
}
最佳答案
您需要创建一个基于块的API，并将一个块传递给displaySelected。
考虑：
- (void)selectDeselectAllPressed:(UIButton*)button {
int id = button.tag;
[SVProgressHUD showWithStatus:@"Updating" maskType:SVProgressHUDMaskTypeGradient];
[self displaySelectedCompletionBlock: ^ (BOOL completed) {
if(!completed) { return; }
if (id == 1) {
[self selectAllD];
} else if (id == 2) {
[self deselectAllD];
} else if (id == 3) {
[self selectAllI];
} else if (id == 4) {
[self deselectAllI];
}
}]; // removes current view so you can load hud will not be behind it
}
在
displaySelectedCompletionBlock:中：- (void)displaySelectedCompletionBlock:(void(^)(BOOL))completionBlock
{
//Setup animations.
[UIView animateWithDuration:0.5 animations: ^ { /* Do animations here. */ } completion:[completionBlock copy]];
}
这是一个简化，但是应该使您知道如何进行。