UITextFiled的LeftView

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];    

    label.backgroundColor = [UIColor clearColor];

    label.textColor = [UIColor lightGrayColor];

    label.text = @"Edit:";

    UITextField *tf = [[UITextField alloc] initWithFrame:CGRectMake(50, 100, 150, 31)];

    tf.borderStyle = UITextBorderStyleRoundedRect;

    tf.leftViewMode = UITextFieldViewModeAlways;    

    tf.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

    tf.leftView = label;

也可以在TextField的leftView上添加图片等我们想添加的东西