UIButton和“下一个”和上一个图像的动作
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因此，对于iPhone开发人员来说，这是一个相当新的东西，并且可以一直学习。我知道我想要什么，但不知道从哪里开始。在此项目之前，我实际上只处理过tableView应用程序，因此我对imageView和自定义操作的实际知识非常缺乏！
我想让UIImageView加载有图像（使用fetchedResultsController填充的数组，因为图像将存储在CoreData DB中）。
我想要一个带有动作“ next”的UIButton和一个带有动作“ previous”的UIButton，它将控制前面提到的imageViews显示的图像。
到目前为止，我已经完成了数据库映射和接口设计，但是未能找到这些问题的答案（我相信对于那些知道的人来说，这将是很直接的）。
任何建议或示例代码将不胜感激。
脱酒石酸
下面的@shawnwall代码段...
-(IBAction)nextImage {
index++;
int imageCount=31;
if (index<=imageCount) {
NSString* imageName=[NSString stringWithFormat:@\"img%i.jpg\", index];
[picture setImage: [UIImage imageNamed: imageName]];
}
}
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@\"Images\" inManagedObjectContext:managedObjectContext];
[request setEntity:entity];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@\"topImage\" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[request setSortDescriptors:sortDescriptors];
[sortDescriptor release];
[sortDescriptors release];
NSError *error = nil;
NSMutableArray *mutableFetchResultsT = [[managedObjectContext executeFetchRequest:request error:&error]mutableCopy];
if (mutableFetchResultsT == nil) {
}
[self setTopImageArray:mutableFetchResultsT];
NSLog(@\"%i\" , [topImageArray count]);
Images *imageS = (Images *)[NSEntityDescription insertNewObjectForEntityForName:@\"Images\" inManagedObjectContext:managedObjectContext];
imageS.topImage = selectedImage;
[topImageArray insertObject:imageS.topImage atIndex:0];
NSLog(@\"%i\" , [topImageArray count]);
[self updateTopIV];
-(void)updateTopIV
{
topIV.image = [topImageArray objectAtIndex:0];
}
- (IBAction)nextTouch
{
[self showPhoto:1];
}
- (IBAction)previousTouch
{
[self showPhoto:-1];
}
- (void)showPhoto:(NSInteger)numberToAdd
{
topIV.image = [topImageArray objectAtIndex:currentPhotoIndex + numberToAdd];
}
没有找到相关结果
已邀请:
2 个回复
先对冈蒲
NSInteger *currentPhotoIndex; - (IBAction)nextTouch { [self showPhoto:1]; // number to add to current, so 1 for next, -1 for previous } - (IBAction)previousTouch { [self showPhoto:-1]; } // Actual \"Logic\" - (void)showPhoto:(NSInteger)numberToAdd { NSArray *arrayOfImages = allTheImagesYouWantToShow UIImageView.image = [arrayOfImages objectAtIndex:currentPhotoIndex + numberToAdd]; // Adding one or subtracting one from the current image\'s index will show the photo immediately before or after it. With this method, you can also skip around to any number you want. }另外，好抓。为了防止NSInteger超出阵列范围，您需要执行以下操作：- (void)showPhoto:(NSInteger)numberToAdd { if (currentPhotoIndex > 0 && < arrayOfImages.count) // Makes sure that the int is within the array { // Show new image } }bab
和.m：-(IBAction)nextClicked:(id)sender { //do stuff imageView.image = whatever; } -(IBAction)prevClicked:(id)sender { //do stuff imageView.image = whatever; }