Question

这是我用于更新textview文本的代码示例，我想传递来自JSON响应的数组中的所有字符串

- (void)viewDidLoad {
[super viewDidLoad];
NSString *parseURL = @"url link";
NSString *encodeurl =[parseURL stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:encodeurl];
NSData *data = [NSData dataWithContentsOfURL:url];
if(data){
    NSError *error;
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options: kNilOptions error:&error];
    NSArray *messageArray = [json objectForKey:@"Branches"];
    for (NSDictionary * dataDict in messageArray) {
        NSString *me = [dataDict objectForKey:@"branch_name"];
        txt.text = me;
    }
}

}

Answer 1

首先，您要一次又一次地在textView中设置for loop文字，以替换之前的文字。因此，您必须append单个字符串中的所有字符串，并在for循环结束后将此字符串分配给UITextView.

由于

Answer 2

正常情况下，它会显示最新的字符串，因为您正在运行循环，此循环中的最新对象会覆盖前一个

您可以在NSMutableString循环

之前使用for

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

然后进入你的for循环呢

[branchesString appendString:[NSString stringWithFormat:@"%@, ", [dataDict objectForKey:@"branch_name"]]];

循环后，您可以将此字符串设置为textView.text

您的代码看起来像这样

if(data){
    NSError *error;
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options: kNilOptions error:&error];
    NSArray *messageArray = [json objectForKey:@"Branches"];

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

    for (NSDictionary * dataDict in messageArray) {
        [branchesString appendString:[NSString stringWithFormat:@"%@ ", [dataDict objectForKey:@"branch_name"]]];
    }

    txt.text = branchesString;

}

Answer 3

只需改变你的for循环，

  for (NSDictionary * dataDict in messageArray) {

    NSString *me = [dataDict objectForKey:@"branch_name"];

    txt.text = [txt.text stringByAppendingString:me]; //change



    //txt.text =messageArray;

    // Do any additional setup after loading the view, typically from a nib.
}

如果你想要新行中的下一个字符串，那么

 txt.text = [txt.text stringByAppendingString:[NSString stringWithFormat:@"%@\n",txt.text]];

如果想用逗号分隔，那么

 txt.text = [txt.text stringByAppendingString:[NSString stringWithFormat:@"%@,",txt.text]];

希望这会有所帮助：）

Answer 4

for / for-each循环是多余的。在阵列上使用componentsJoinedByString:。

NSArray *messageArray = [json objectForKey:@"Branches"];

txt.text = [messageArray componentsJoinedByString:@"\n"]; // linebreak between each message

// Use a space, comma, linebreak (\n), or whatever separator you prefer.

Answer 5

NSArray * arrMsg = [json valueForKeyPath:@"Branches.branch_name"];

txt.text = [arrMsg componentsJoinedByString:@"\n"];  //use your saperator which you want to join the strings

如何在iOS中的JSON数据数组中在textview中显示字符串数组？

5 个答案: