IOS UI 代码创建UIButton，UITextField，UILabel

    //add a Label

    UILabel *label=[[UILabelalloc]initWithFrame:CGRectMake(100,20, 150, 40)];

    [label setText:@"i am a label "];

    label.font=[UIFontsystemFontOfSize:20];

    label.textAlignment=NSTextAlignmentLeft;

    //文字内容自适应标签宽度

    label.adjustsFontSizeToFitWidth=YES;

    [self.viewaddSubview:label];

   

   

    //add a button

    UIButton *button=[UIButtonbuttonWithType:UIButtonTypeRoundedRect];

    [button setFrame:CGRectMake(100,300, 150, 40)];

    [button setTitle:@"i am a button"forState:UIControlStateNormal];

    //[button addTarget:selfaction:@selector(makeAnotherButton:)forControlEvents:UIControlEventTouchUpInside];

    [self.viewaddSubview:button];

   

   

   

    //add a textField

    UITextField *textField=[[UITextFieldalloc] initWithFrame:CGRectMake(100,150, 150, 40)];

    //[textField setText:@"i am atextField"];

    //只是显示password这个标识

    textField.placeholder=@"password";

    //密码编辑显示圆点PASSWORD

    textField.secureTextEntry=YES;

    //再次对textField编辑时清除内容

    textField.clearsOnBeginEditing=YES;

    //当编辑的时候才有clearButton

    textField.clearButtonMode=UITextFieldViewModeWhileEditing;

    //默认键盘

    textField.keyboardType=UIKeyboardTypeDefault;

   //边框样式 这个我觉得最好看

    textField.borderStyle=UITextBorderStyleRoundedRect;

    textField.textColor=[UIColorblueColor];

    [self.viewaddSubview:textField];

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