在字典内部和字典数组中查找字典键
在字典内部和字典数组中查找字典键
提问于 2013-05-01 21:39:24
我有一个包含几个NSMutableDictionary对象的数组。
每次填写文本字段并按下提交按钮时：
//The strings
NSString *dateString = @"Date";
NSString *timeString = @"Time";
NSString *typeString = @"Type";
- (IBAction)addData:(id)sender {
[_myDictionary setObject:_dateLabel.text forKey:dateString];
[_myDictionary setObject:_nNumber.text forKey:timeString];
[_myDictionary setObject:_type.text forKey:typeString];
[_myArray addObject:_myDictionary];
[self display]
}然后，我尝试在UItextView中显示结果(在本例中为date)，但我不知道如何显示。
-(void)displayData{
for (int i = 0; i<_myArray.count; i++) {
[_myArray objectAtIndex:i];
outputString = [outputString stringByAppendingFormat:@"%@\n",[_myDictionary objectForKey:@"Date"]];
}
_myTextView.text = [NSString stringWithFormat:@"%@",outputString];
}这最终显示数组中最后一个Dictionary的日期。我甚至不知道如何从特定的字典中记录日期。
说[_myArray objectAtIndex:3] [_myDictionary objectForKey:@"Date"]。我如何记录第三个索引中的日期？
希望这是有意义的
EDIT SOLUTION
for (int i = 0; i<_myArray.count; i++)
{
outputString = [outputString stringByAppendingFormat:@"%@ %@\n",[[_myArray objectAtIndex:i]objectForKey:@"Date"], [[_myArray objectAtIndex:i]objectForKey:@"Time"]];
}
_myTextView.text = [NSString stringWithFormat:@"%@",outputString];
}感谢您的快速帮助！！
回答 4
Stack Overflow用户
回答已采纳
发布于 2013-05-01 21:48:45
for(int i =0 ;i <[array count];i++)
{
NSLog(@"%@",[[array objectAtIndex:i]allKeys]);
}此方法将打印所有密钥
Stack Overflow用户
发布于 2013-05-01 21:49:51
第一件事是每次向数组添加新对象时都必须分配一个新字典，否则字典将只保存最后一个值，因此
- (IBAction)addData:(id)sender
{
NSMutableDictionary *_myDictionary=[[NSMutableDictionary alloc] init];
[_myDictionary setObject:_dateLabel.text forKey:dateString];
[_myDictionary setObject:_nNumber.text forKey:timeString];
[_myDictionary setObject:_type.text forKey:typeString];
[_myArray addObject:_myDictionary];
[self display]
}现在，so所在的部分正在显示值
-(void)displayData
{
for (int i = 0; i<_myArray.count; i++)
{
NSMutableDictionary *dictionary = [_myArray objectAtIndexPath:i];
outputString = [outputString stringByAppendingFormat:@"%@\n",[dictionary objectForKey:@"Date"]];
}
_myTextView.text = [NSString stringWithFormat:@"%@",outputString];
}Stack Overflow用户
发布于 2013-05-01 21:47:57
试一试
-(void)displayData{
NSMutableString *outputString = [NSMutableString string];
for (NSDictionary *dict in _myArray) {
[outputString stringByAppendingFormat:@"%@\n",dict[@"Date"]];
}
_myTextView.text = [NSString stringWithString:outputString];
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/16319191
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