以编程方式从变量设置UISegmentedControl文本

时间:2012-12-29 13:04:57

标签: ios xcode uisegmentedcontrol

我在使用storyboard的视图上有一个UISegmentedControl,目前正在使用以下代码行编写文本:

[segMonth setTitle:@"Month 1" forSegmentAtIndex:0];
[segMonth setTitle:@"Month 2" forSegmentAtIndex:1];

我还有一个使用此代码的日期函数,它获取当前月份的数字(1-12):

// Date
    NSDate *now = [NSDate date];
    NSString *strDate = [[NSString alloc] initWithFormat:@"%@",now];
    NSArray *arr = [strDate componentsSeparatedByString:@" "];
    NSString *str;
    str = [arr objectAtIndex:0];

    NSArray *arr_my = [str componentsSeparatedByString:@"-"];

    NSInteger month = [[arr_my objectAtIndex:1] intValue];
//End Date

我试图将当前月份“12月”的第一段命名为下一个月“1月份”的第二段。

我尝试使用以下代码,但它似乎不起作用:

[segMonth setTitle:@"%d" forSegmentAtIndex:0];
[segMonth setTitle:@"%d" forSegmentAtIndex:1];

显然,这也只会给出月份的数量,而不是名称..

4 个答案:

答案 0 :(得分:1)

您传入字符串格式化程序并期望它包含月份的名称。尝试

[segMonth setTitle:[NSString stringWithFormat:@"%@",str1] forSegmentAtIndex:0];
[segMonth setTitle:[NSString stringWithFormat:@"%@",str2] forSegmentAtIndex:1];

str1和str2应该是包含月份名称的字符串(可通过NSDateFormatter获得)。

答案 1 :(得分:1)

从这样的数字中获取月份名称:

 NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease];
 NSString *monthName = [[df monthSymbols] objectAtIndex:(yourMonthNumberHere-1)];

现在使用它:

 [segMonth setTitle:monthName forSegmentAtIndex:0];

答案 2 :(得分:1)

我已经看到了你的代码,其中包含了从NSDate获得一个月的非常困难的方法。我知道,这可能不是答案。但我只是要求您检查此代码,以了解获取月份,日期或时间或与NSDate分开的任何内容的正确方法。

NSDate *today = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc]
                         initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorian components:NSMonthCalendarUnit fromDate:today];
NSInteger currentMonth = [components month]; // this will give you the integer for the month number

[components setMonth:1];
NSDate *newDate = [gregorian dateByAddingComponents:components toDate:today options:0];
NSDateComponents *nextComponents = [gregorian components:NSMonthCalendarUnit fromDate:newDate];

<强>更新:

NSInteger nextMonth = [nextComponents month]; // this will give you the integer for the month number

并且@Prince说你可以从NSDateFormatter获得月份名称。无论如何,我重复一遍让你明白。

NSDateFormatter *df = [[NSDateFormatter alloc] init];
NSString *currentMonthName = [[df monthSymbols] objectAtIndex:(currentMonth-1)];
NSString *nextMonthName = [[df monthSymbols] objectAtIndex:(nextMonth-1)];

[segMonth setTitle:currentMonthName forSegmentAtIndex:0];
[segMonth setTitle:nextMonthName forSegmentAtIndex:1];

答案 3 :(得分:0)

int currentMonth = 12;   //December
int nextMonth = 1;   //January
NSDateFormatter *df1 = [[[NSDateFormatter alloc] init] autorelease];
NSString *currentMonthName = [[df1 monthSymbols] objectAtIndex:(currentMonth-1)];

NSDateFormatter *df2 = [[[NSDateFormatter alloc] init] autorelease];
NSString *nextMonthName = [[df2 monthSymbols] objectAtIndex:(nextMonth-1)];

[segMonth setTitle:currentMonthName forSegmentAtIndex:0];
[segMonth setTitle:nextMonthName forSegmentAtIndex:1];

请注意,您需要从currentMonth和nextMonth(从1到12)中减去1,因为monthSymbols从零开始。