objective-c 把所有类型为UIButton的子控件放在父视图中央 动态创建按钮

for(UIView *view in [self.backgroundView subviews])

{

//[view removefromsuperview];

if([[[view superclass] description] isEqualToString:@"UIButton"])

{

UIButton * btn=(UIButton*) view;

btn.titleLabel.text=@"dynamic title";

btn.center=btn.superview.center;

}

}

- (IBAction)addButton:(id)sender {

CGRect frame = CGRectMake(90, 200, 200, 60);

UIButton *someAddButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

someAddButton.backgroundColor = [UIColor clearColor];

[someAddButton setTitle:@"动态添加一个按钮!" forState:UIControlStateNormal];

someAddButton.frame = frame;

[someAddButton addTarget:self action:@selector(someButtonClicked) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:someAddButton];

}

-(void) someButtonClicked{

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"

message:@"您点击了动态按钮！"

delegate:self

cancelButtonTitle:@"确定"

otherButtonTitles:nil];

[alert show];

}