ios - 从数组索引 obj c 加载某些信息

Question

我有一个数组，可以像这样从 plist 加载信息:

NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:@"items.plist"];

这是 plist 的样子:

<array>
<dict>
    <key>string</key>
    <string>STR</string>
    <key>id</key>
    <string>0</string>
</dict>
<dict>
    <key>string</key>
    <string>STR2</string>
    <key>id</key>
    <string>1</string>
</dict>
<dict>
    <key>string</key>
    <string>STR3</string>
    <key>id</key>
    <string>2</string>
</dict>
<dict>
    <key>string</key>
    <string>STR4</string>
    <key>id</key>
    <string>35</string>
    <key>data</key>
    <string>5</string>
</dict>
</array>

我还创建了一个 for 循环，它为 plist 中的每个字符串创建一个 UIButton，如果索引包含“数据”键，我该如何检查循环？我想检查索引是否有数据，以便我可以为按钮设置图像。

Answer 1

像这样的东西应该可以工作:

NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:@"items.plist"];
for (NSDictionary * dict in array) {
    UIButton * newBtn = [UIButton buttonWithType:UIButtonTypeSystem];
    [newBtn setTitle:dict[@"id"] forState:UIControlStateNormal];

    // -- Update for comment -- //
    // See if data exists
    if (dict[@"data"]) {
        // if data's value is an image ...
        [newBtn setImage:dict[@"data"] forState:UIControlStateNormal];

        // In your question the values for @"data" are integers, so make sure you don't try to add that as an image.

    }

    // do other stuff with button ...

}