我有一个方法可以生成以下类型的动画：
-(void)loadButtonView{
AppDelegate *delegateVariable = (AppDelegate *)[[UIApplication sharedApplication] delegate];
UIView *scrollButtonPlaceHolder = [[UIView alloc] initWithFrame:CGRectMake(4, 230, 312,320)];
[scrollButtonPlaceHolder setBackgroundColor:[UIColor colorWithRed:102.0/255.0 green:153.0/255.0 blue:255.0/255.0 alpha:1]];
scrollButtonPlaceHolder.tag = 999;
scrollButtonPlaceHolder.layer.cornerRadius = 10; // this value vary as per your desire
scrollButtonPlaceHolder.clipsToBounds = YES;
for (int i = 1; i < 5; i ++) {
NSString *prodName = nil;
UIImage *img = nil;
if([delegateVariable.archiveArray count] >= i ){
PriceMatchDetails *pmd = [delegateVariable.archiveArray objectAtIndex:[delegateVariable.archiveArray count]-i];
NSURL *url = [NSURL URLWithString:pmd.imageURL];
NSData *data = [NSData dataWithContentsOfURL:url];
img = [[UIImage alloc] initWithData:data];
prodName = pmd.productName;
}else{
prodName = @"N.A";
NSURL *url = [NSURL URLWithString:@"http://i.imgur.com/LYFebhz.png"];
NSData *data = [NSData dataWithContentsOfURL:url];
img = [[UIImage alloc] initWithData:data];
}
CGFloat x1 = 20;
CGFloat y1 = 20;
if (i%2 == 1) {
if(i ==3){
y1 = y1 +150;
}
}else if (i%2 == 0){
if(i == 2){
x1 = x1 + 150;
}else{
x1 = x1 + 150;
y1 = y1 +150;
}
}
UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(x1,y1, 120, 120);
button.layer.cornerRadius = 10; // this value vary as per your desire
button.clipsToBounds = YES;
//[self performSelector:(SEL) withObject:(id) afterDelay:(NSTimeInterval)]
[self animateButton:button andLabelString:prodName andimage:img];
[scrollButtonPlaceHolder addSubview:button];
}
[self.view addSubview:scrollButtonPlaceHolder];
}
-(void)animateButton:(UIButton *)button1 andLabelString:(NSString *)labelText andimage:(UIImage *)btnImage{\
int randNum = rand() % (7 -5) + 5;
button1.alpha = 1.0;
[button1 setBackgroundImage:btnImage forState:UIControlStateNormal];
[UIView animateWithDuration:randNum delay:0 options:UIViewAnimationOptionAllowUserInteraction
animations:^(void) {
button1.alpha = 0.0;
}
completion:^(BOOL finished){
[UIView animateWithDuration:randNum delay:0 options:UIViewAnimationOptionAllowUserInteraction
animations:^(void) {
button1.alpha = 1.0;
[button1 setBackgroundImage:nil forState:UIControlStateNormal];
[button1 setTitle:labelText forState:UIControlStateNormal];
button1.titleLabel.font = [UIFont boldSystemFontOfSize:8.0];
button1.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
button1.titleLabel.textAlignment = NSTextAlignmentCenter;
}
completion:^(BOOL finished){
[UIView animateWithDuration:randNum delay:0 options:UIViewAnimationOptionAllowUserInteraction
animations:^(void) {
button1.alpha = 0.0;
}completion:^(BOOL finished){
[button1 setTitle:nil forState:UIControlStateNormal];
[self animateButton:button1 andLabelString:labelText andimage:btnImage];
}];
}];
}];
}
此方法在 - （void）ViewDiDAppear
下调用当我使用presentViewController委托方法
呈现此页面时 UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"MainVC"];
vc.view.backgroundColor = [UIColor clearColor];
self.modalPresentationStyle = UIModalPresentationFullScreen;
[self presentViewController:vc animated:NO completion:nil];
使用IBAction。当我按下该按钮时，此loadButtonView方法会减慢转换速度。 在启动时，首先显示相同的视图控制器，并在视图出现后单独将新的scrollButtonPlaceHolder添加到视图中。但转换仍然等待loadButtonView启动。有关如何在显示ViewController后缓慢加载此视图的任何建议吗？