开发笔记:ios导航栏（自己定义和使用系统方式）

系统方式：

//1.设置导航栏背景图片
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [[UIImage alloc]init];

[[self navigationController] setNavigationBarHidden:NO animated:YES];
self.navigationController.navigationBar.backgroundColor = [[UIColor alloc] initWithRed:248/255.0 green:248/255.0 blue:248/255.0 alpha:1.0];

//2.导航面板左边的取消按钮
UIButton* cancelButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
if(cancelButton != nil)
{
[cancelButton setTitle:POST_CANCEL_BUTTON forState: UIControlStateNormal];
[cancelButton setFrame:CGRectMake(0, 0, WIDTH_SCREEN/5.0, 44)];
[cancelButton setTitleColor:[[UIColor alloc] initWithRed:0 green:158/255.0 blue:150/255.0 alpha:1.0]forState:UIControlStateNormal];
cancelButton.titleLabel.fOnt= [UIFont systemFontOfSize: 16.0];
cancelButton.cOntentHorizontalAlignment= UIControlContentHorizontalAlignmentLeft;
[cancelButton addTarget:self action:@selector(cancelButtonEventTouchUpInside)
forControlEvents :UIControlEventTouchUpInside];

UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:cancelButton];
if(leftItem != nil)
{
self.navigationItem.leftBarButtOnItem= leftItem;
}
}

//3.导航面板右边的公布按钮
UIButton* postButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
if (postButton != nil)
{
[postButton setFrame:CGRectMake(0, 0, WIDTH_SCREEN/5.0, 44)];
[postButton setTitle:@"公布" forState:UIControlStateNormal];
[postButton setTitleColor:[[UIColor alloc] initWithRed:0 green:158/255.0 blue:150/255.0 alpha:1.0]forState:UIControlStateNormal];
postButton.titleLabel.fOnt= [UIFont systemFontOfSize: 16.0];
postButton.cOntentHorizontalAlignment= UIControlContentHorizontalAlignmentRight;
[postButton addTarget:self action:@selector(postButtonEventTouchUpInside)
forControlEvents :UIControlEventTouchUpInside];
UIBarButtonItem *rightItem = [[UIBarButtonItem alloc] initWithCustomView:postButton];
if(rightItem != nil)
{
self.navigationItem.rightBarButtOnItem= rightItem;
}
}

//4.导航面板中部文字
UILabel* navigatiOnLabel= [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 0, 44)];
if (navigationLabel != nil)
{
[navigationLabel setTextColor:[UIColor blackColor]];
navigationLabel.text = POST_NAVIGATION_TITLE;
[navigationLabel setTextAlignment:NSTextAlignmentCenter];
navigationLabel.fOnt= [UIFont systemFontOfSize:18.0];
self.navigationItem.titleView = navigationLabel;
}

//5.导航以下的一条切割线
UIView* line = [[UIView alloc]initWithFrame:CGRectMake(0, 20 + 44,WIDTH_SCREEN, 1)];
if (line != nil)
{
line.backgroundColor = [[UIColor alloc] initWithRed:221/255.0 green:221/255.0 blue:221/255.0 alpha:1.0];
[self.view addSubview:line];
}

自己定义：

//1.创建导航栏视图
UIView *navView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, WIDTH_SCREEN, 65)];
if (navView != nil)//当导航视图没有载入成功的时候推出该方法
{
//1.为导航视图设置背景
navView.backgroundColor = [UIColor colorWithRed:248 / 255.0 green:248 / 255.0 blue:248 / 255.0 alpha:1];
[[self navigationController] setNavigationBarHidden:YES animated:YES];

//2.导航面板左边的取消按钮
UIButton* leftButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
if (leftButton != nil)
{
leftButton.frame = CGRectMake(15, 20, 65, 44);
[leftButton setTitle:POST_CANCEL_BUTTON forState: UIControlStateNormal];
[leftButton setTitleColor:[[UIColor alloc] initWithRed:0 green:158/255.0 blue:150/255.0 alpha:1.0]forState:UIControlStateNormal];
leftButton.titleLabel.fOnt= [UIFont systemFontOfSize: 16.0];
leftButton.cOntentHorizontalAlignment= UIControlContentHorizontalAlignmentLeft;
[leftButton addTarget:self action:@selector(cancelButtonEventTouchUpInside)
forControlEvents :UIControlEventTouchUpInside];
[navView addSubview:leftButton];
}
//3.导航面板右边的公布按钮
UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
if (rightButton != nil)
{
[rightButton setFrame:CGRectMake(WIDTH_SCREEN - 80, 20, 65, 44)];
[rightButton setTitle:@"公布" forState:UIControlStateNormal];
[rightButton setTitleColor:[[UIColor alloc] initWithRed:0 green:158/255.0 blue:150/255.0 alpha:1.0]forState:UIControlStateNormal];
rightButton.titleLabel.fOnt= [UIFont systemFontOfSize: 16.0];
rightButton.cOntentHorizontalAlignment= UIControlContentHorizontalAlignmentRight;
[rightButton addTarget:self action:@selector(postButtonEventTouchUpInside)
forControlEvents :UIControlEventTouchUpInside];
[navView addSubview:rightButton];
}

//4.导航面板中部文字
UILabel* navTitle = [[UILabel alloc] initWithFrame:CGRectMake(80, 20, WIDTH_SCREEN - 80 - 80, 44)];
if (navTitle != nil)
{
[navTitle setTextColor:[UIColor blackColor]];
navTitle.text = POST_NAVIGATION_TITLE;
[navTitle setTextAlignment:NSTextAlignmentCenter];
navTitle.fOnt= [UIFont systemFontOfSize:18.0];
[navView addSubview:navTitle];
}

//5.在导航视图底加入切割线
UIView *navDividingLine = [[UIView alloc] init];
if (navDividingLine != nil)
{
navDividingLine.frame = CGRectMake(0, 20 + 44, WIDTH_SCREEN, 1);
navDividingLine.backgroundColor = [UIColor colorWithRed:221 / 255.0 green:221 / 255.0 blue:221 / 255.0 alpha:1];
[navView addSubview:navDividingLine];
}

//6.往view添加导航栏
[self.view addSubview:navView];
}