在的ABPeoplePickerNavigationController

Question

我無法得到這個代碼來設置提示設置提示：

// Create a PeoplePicker 
ABPeoplePickerNavigationController *objPeoplePicker = [[ABPeoplePickerNavigationController alloc] init]; 
[objPeoplePicker setPeoplePickerDelegate:self]; 

// Customize colors 
objPeoplePicker.topViewController.navigationController.navigationBar.tintColor = [UIColor colorWithRed:0.294 green:0.278 blue:0.247 alpha:1.0]; 
objPeoplePicker.topViewController.searchDisplayController.searchBar.tintColor = [UIColor colorWithRed:0.294 green:0.278 blue:0.247 alpha:1.0]; 

// Only display phone numbers 
NSArray *displayedItems = [NSArray arrayWithObjects:[NSNumber numberWithInt:kABPersonPhoneProperty], nil]; 
objPeoplePicker.displayedProperties = displayedItems; 

// Add a prompt 
objPeoplePicker.navigationBar.topItem.prompt = @"Choose a contact to..."; 

// Show the picker 
[self presentModalViewController:objPeoplePicker animated:YES]; 

「添加提示」一節似乎並沒有被設置的提示。有任何想法嗎？下面是一個輸出的截圖：

Answer 1

的關鍵信息到這個問題，並沒有很明顯的，就是你需要設置提示後線：

[self presentModalViewController:objPeoplePicker animated:YES]; 

所以，如果你這樣做，它的工作原理：

[self presentModalViewController:objPeoplePicker animated:YES]; 
objPeoplePicker.navigationBar.topItem.prompt = @"Choose a contact to...";