iphone - 写入 UITextView

Question

我需要使用预定义位置字符串“Office”从所有日历中检索所有 iOS 事件，然后将结果写入 NSLog 和 UITextView。

到目前为止，这是我的代码:

    #import "ViewController.h"

    @interface ViewController ()

    @end

    @implementation ViewController

    @synthesize eventStore = _eventStore;
    @synthesize events     = _events;
    @synthesize eventTextView;

    - (void)viewDidLoad
    {

        // Store a reference to the event store
        EKEventStore *eventStore = [[EKEventStore alloc] init];

       [eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted,            
    NSError *error) {
                // handle access here
            if (granted)
                NSLog (@"Access granted");
        }];
        self.eventStore = eventStore;

        // Define a range of event dates we want to display

        NSDate *startDate = [NSDate dateWithTimeIntervalSinceNow:(-1*60*60)]; // 1 hour in  

    the past
        NSDate *endDate   = [NSDate dateWithTimeIntervalSinceNow:(60*60*24*365)]; // 1 year  

    from now

        // Create a predicate to search all celndars with our date range

        NSPredicate *predicate = [self.eventStore predicateForEventsWithStartDate:startDate
        endDate:endDate calendars:nil];


        // Query the event store using the predicate.

        NSArray *results       = [self.eventStore eventsMatchingPredicate:predicate];

        //Convert the results to a mutable array and store so we can implement swipe to 

    delete

        NSMutableArray *events = [[NSMutableArray alloc] initWithArray:results];
        self.events = events;


        // Load the events from the event store
        //[self reloadEvents:nil];

        [super viewDidLoad];
    }

    - (void)didReceiveMemoryWarning
    {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }

    - (void) reloadEvents:(id)sender
    {
   }

    - (IBAction)getEvents:(id)sender {

        int i;
        int eventCount;

        eventCount = [self.events count];

        for (i = 0; i < eventCount; i++){

            self.eventTextView.text = [[self.events objectAtIndex: i]title], [[self.events 

    objectAtIndex: i]startDate], [[self.events objectAtIndex: i]endDate], [[self.events     

    objectAtIndex: i]location];


            NSLog (@"Event Title: %@, Event Start Date: %@, Event End Date: %@, Event 

    Location: %@",[[self.events objectAtIndex: i]title],
                [[self.events objectAtIndex: i]startDate],
                [[self.events objectAtIndex: i]endDate],
                [[self.events objectAtIndex: i]location]);
        }

    }
    @end

UITextView“eventTextView”中的结果是我只获得了我的最后一个事件标题，没有别的，但是在我的控制台中我获得了我所要求的一切。我这样做的方式正确吗？

此外，我了解到您可以订阅事件存储以获取通知/日历更改？在上述情况下，这将如何运作？我假设这将取代按钮操作，特别是如果应用程序设置为进入后台？

Answer 1

问题在这里:

self.eventTextView.text = [[self.events objectAtIndex: i]title], [[self.events 
objectAtIndex: i]startDate], [[self.events objectAtIndex: i]endDate], [[self.events     
objectAtIndex: i]location];

请注意，您在循环的每次迭代中都替换 UITextView 的内容。您的意图是串联，在 Objective-C 中最好通过创建 NSMutableString 并对其调用 appendString 方法来处理。

循环外:

NSMutableString *textVal = [[NSMutableString alloc] init];

在你的循环中:

[textVal appendString:[[self.events objectAtIndex: i]title], [[self.events 
objectAtIndex: i]startDate], [[self.events objectAtIndex: i]endDate], [[self.events     
objectAtIndex: i]location]];

循环后:

self.eventTextView.text = [NSString stringWithString:textVal];