Ios uitextfield显示，但按钮未显示

将显示

ui文本字段

，但不会显示

ui按钮

。 如何显示按钮

UITextField *password = [[UITextField alloc] initWithFrame:CGRectMake(30.0, 150, 300, 30.0)];
password.delegate = self;
[password setBorderStyle:UITextBorderStyleRoundedRect];
[password setClearButtonMode:UITextFieldViewModeAlways];
password.placeholder = @"Password";
[password setFont:[UIFont systemFontOfSize:10]];
[self.view addSubview:password];
//button
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(30, 200 , 50, 50)] ;
[button addTarget:self action:@selector(clicked) forControlEvents:UIControlEventTouchUpInside];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button = [UIButton buttonWithType: UIButtonTypeSystem];

 [self.view addSubview:button];

---

尝试添加按钮的

BackgroundColor

和

TitleColor

：

[button setBackgroundColor:[UIColor greenColor]];
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

---

您正在初始化按钮两次

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(30, 200 , 50, 50)] ;

button = [UIButton buttonWithType: UIButtonTypeSystem];

初始化系统按钮，稍后设置其框架

UIButton *button = [UIButton buttonWithType: UIButtonTypeSystem];
button.frame = CGRectMake(30, 200 , 50, 50);

---

希望这会有所帮助。

非常感谢您的帮助