确定在 JSQMessagesViewController 上显示多少消息
Determine how many messages are shown on JSQMessagesViewController
我希望有一种非常简单的方法来了解当前使用 JSQMessagesViewController 显示了多少条消息。找不到任何直接询问控制器的信息。有吗?
试试这个:
在query.limit中,您可以设置显示消息的数量。即使我试图掌握这一点,但在他的聊天示例中看到了 JesseHu 的实现。
func loadMessages() {
if self.isLoading == false {
self.isLoading = true
var lastMessage = messages.last
var query = PFQuery(className: <your class name>)
query.whereKey(PF_CHAT_GROUPID, equalTo: groupId)// query params
if lastMessage != nil {
query.whereKey(PF_CHAT_CREATEDAT, greaterThan: lastMessage?.date)
}
query.includeKey(PF_CHAT_USER)
query.orderByDescending(PF_CHAT_CREATEDAT)
query.limit = 25
query.findObjectsInBackgroundWithBlock({ (objects: [AnyObject]!, error: NSError!) -> Void in
if error == nil {
self.automaticallyScrollsToMostRecentMessage = false
for object in (objects as! [PFObject]!).reverse() {
self.addMessage(object)
}
if objects.count > 0 {
self.finishReceivingMessage()
self.scrollToBottomAnimated(false)
}
self.automaticallyScrollsToMostRecentMessage = true
} else {
println("Network error")
}
self.isLoading = false;
})
}
}
获取可用消息总数:
// If you don't have multiple sections, simply go get the number of message in the first section
NSInteger numberOfAvailableMessages = [self.collectionView numberOfItemsInSection:0];
注意在数据加载到屏幕后调用
我希望有一种非常简单的方法来了解当前使用 JSQMessagesViewController 显示了多少条消息。找不到任何直接询问控制器的信息。有吗?
试试这个:
在query.limit中,您可以设置显示消息的数量。即使我试图掌握这一点,但在他的聊天示例中看到了 JesseHu 的实现。
func loadMessages() {
if self.isLoading == false {
self.isLoading = true
var lastMessage = messages.last
var query = PFQuery(className: <your class name>)
query.whereKey(PF_CHAT_GROUPID, equalTo: groupId)// query params
if lastMessage != nil {
query.whereKey(PF_CHAT_CREATEDAT, greaterThan: lastMessage?.date)
}
query.includeKey(PF_CHAT_USER)
query.orderByDescending(PF_CHAT_CREATEDAT)
query.limit = 25
query.findObjectsInBackgroundWithBlock({ (objects: [AnyObject]!, error: NSError!) -> Void in
if error == nil {
self.automaticallyScrollsToMostRecentMessage = false
for object in (objects as! [PFObject]!).reverse() {
self.addMessage(object)
}
if objects.count > 0 {
self.finishReceivingMessage()
self.scrollToBottomAnimated(false)
}
self.automaticallyScrollsToMostRecentMessage = true
} else {
println("Network error")
}
self.isLoading = false;
})
}
}
获取可用消息总数:
// If you don't have multiple sections, simply go get the number of message in the first section
NSInteger numberOfAvailableMessages = [self.collectionView numberOfItemsInSection:0];
注意在数据加载到屏幕后调用