新建搜索bar

CGFloat enterW = self.view.frame.size.width - 80;// 245;
    CGFloat y = 0;
    containerView = [[UIView alloc] initWithFrame:CGRectMake(0, y, self.view.frame.size.width, 40)];
    [self.view addSubview:containerView];
    
    
    textField = [[UITextField alloc] initWithFrame:CGRectMake(10, 5, enterW-10, 30)];
    textField.font = [UIFont systemFontOfSize:18.0f];
    textField.returnKeyType = UIReturnKeyDone;
    textField.clearButtonMode = UITextFieldViewModeWhileEditing; //显示一次性删除按钮
    textField.backgroundColor = [UIColor whiteColor];
    textField.layer.borderWidth = 1.0;
    textField.layer.cornerRadius = 5.0;
    textField.layer.borderColor = [UIColor lightGrayColor].CGColor; //显示边框颜色
    textField.leftViewMode = UITextFieldViewModeAlways;
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter; //控件居中
    textField.leftView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"searchIcon"]];
    textField.leftView.contentMode=UIViewContentModeCenter;  //显示左边放大镜
    textField.autoresizingMask = UIViewAutoresizingFlexibleWidth;

[containerView addSubview:textField];
 
    
    UIButton *uploadBtn = [[UIButton alloc] init];
    uploadBtn.frame = CGRectMake(self.view.frame.size.width - 70 - 5, 5, 70, 30);
    [uploadBtn setTitle:@"搜索" forState:UIControlStateNormal];
    [uploadBtn successStyle];

[uploadBtn addTarget:self action:@selector(uploadBtnPressed) forControlEvents:UIControlEventTouchUpInside];

[containerView addSubview:uploadBtn];

[containerView addObserver:self forKeyPath:@"frame" options:NSKeyValueObservingOptionNew context:nil];
    
    NSLog(@"containerView y %f", containerView.frame.origin.y);