Summer vacation second week wrap-up blog

UINavigationController Background color design problem

1. 升级到 Xcode 13 之前写的关于导航条 navigationBar 的颜色设置是直接调用 barTintColor 属性就可以实现.然而到了Xcode 13 颜色设置却失效了.

之前的代码：

	// 设置不透明
self.navigationController.navigationBar.translucent = NO;
    // 设置背景颜色
self.navigationController.navigationBar.tintColor = [UIColor redColor];

2. 改之后

UINavigationBarAppearance* appearance = [[UINavigationBarAppearance alloc] init];
    // 添加背景颜色
    appearance.backgroundColor = [UIColor redColor];
    appearance.shadowImage = [[UIImage alloc] init];
    appearance.shadowColor = nil;
    
    self.navigationController.navigationBar.standardAppearance = appearance;
    self.navigationController.navigationBar.scrollEdgeAppearance = appearance;

button select settings

创建按钮时,Set the styles for both the normal state and the selected state at the same time.

UIButton* button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(100, 300, 200, 200);
    button.selected = NO;
    // 提取图片
    UIImage* icon01 = [[UIImage imageNamed:@"btn01.jpeg"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    
    UIImage* icon02 = [[UIImage imageNamed:@"btn02.jpeg"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    // Set the normal status picture
    [button setImage:icon01 forState:UIControlStateNormal];
    // 设置选中状态图片
    [button setImage:icon02 forState:UIControlStateSelected];
    // 添加事件
    [button addTarget:self action:@selector(pressButton:) forControlEvents:UIControlEventTouchUpInside];

Then add the code to toggle the selected state in the click event.

- (void) pressButton:(UIButton*)button {
    
    // 切换选中状态
    button.selected = !button.selected;
}

UITabBarItemImage setting problem

When I set it as followsUITabBarItemWhen you encounter pictures,图片无法显示问题（It shows up as a large block of color）.

UITabBarItem* TabBarItem = [[UITabBarItem alloc] initWithTitle:nil image:[UIImage imageNamed:@"56.png"] selectedImage:[UIImage imageNamed:@"firstbutton_pressed.png"]];
    
navigationController.tabBarItem = TabBarItem;

示：

This can be solved by changing the rendering mode of the image：

UITabBarItem* TabBarItem = [[UITabBarItem alloc] initWithTitle:nil image:[[UIImage imageNamed:@"56.png"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] selectedImage:[[UIImage imageNamed:@"firstbutton_pressed.png"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
    
navigationController.tabBarItem = TabBarItem;

改为 imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal.