如何在 ViewController 类范围之外执行 [self.view addSubview: lbl] ？
or:
如何在 ViewController 类之外的主视图中的不同类中添加标签或另一个视图？
thanks
- (void)viewDidLoad {
[super viewDidLoad];
UILabel *lbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[lbl setText:@"hi there"];
[self.view addSubview:lbl];// <-- this works, but ...
// what is "self" referring to?
// and how can I declare and call from another class?
...
UILabel *lbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[lbl setText:@"hi there"];
calcRomanAppDelegate *v = [[calcRomanAppDelegate new] init];
[v.viewController.view addSubview:lbl]; // this compiles, but...
// fails to shows a label on the form
...
UILabel *lbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[lbl setText:@"hi there"];
calcRomanViewController *v = [[calcRomanViewController new] init];
[v.view addSubview:lbl]; // this just makes a call back to viewDidLoad... endless loop
}
Well, view只是一个属性UIViewController班级。假设你有你的UIViewController *controller变量某处，你可以使用
[controller.view addSubview:subview]
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