objective-c - 如何通过字符串获取实例名称

Question

在Objective-C中如何通过一定的规则获取实例名？

例如:

类型 1:self.btn(0,1,2,3,4,5,6,7,8,9...) 在 for 循环中从 i 获取数字

for(int i = 0; i<10; i++){
//wrong code ( similar ActionScript3.0 code)
self."btn"+i = [UIButton buttonWithType:UIButonTypeRoundRect];
//i think code but, not available
self.[NSString stringWithFormat:@"btn%d", i] = [UIButton buttonWithType:UIButtonTypeRoundedRect];
}

Type2: UIButton *btn(0,1,2,3,4,5,6,7,8,9...) for loop get number from i

for(int i =0; i<10; i++){
//wrong code ( similar ActionScript3.0 code)
UIButton *"btn"+i = [UIButton buttonWithType:UIButtonTypeRoundRect];
//i think code but, not available
UIButton *[NSString stringWithFormat:@"btn%d", i] = [UIButton buttonWithType:UIButtonTypeRoundedRect];
}

因此，在 ActionScript3.0 中，源代码如下。

for( var i=0; i<10; i++){
this["btn"+i] = new SimpeButton();
//btn0, btn1, btn2...btn10 get by for loop i object Simpebutton ten.
}

Answer 1

在 objective-c 中没有按钮的实例名称。有一个标签属性，您可以在其中存储整数值，以便识别正确的按钮。您可以在循环中创建按钮，设置适当的标签属性并存储在数组中:

NSMutableArray *buttonsArray = [[NSMutableArray alloc] init];
for( var i=0; i<10; i++) {
     UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundRect];
     button.tag = i;
     [buttonsArray addObject:button];
}

然后你可以用一种方式循环这个数组:

for (UIButton *aButton in buttonsArray) {
     // do something with aButton instance
}

或另一个:

for (int i=0; i<[buttonsArray count]; i++) {
     // do something with [buttonsArray objectAtIndex:i];
}