2019独角兽企业重金招聘Python工程师标准>>> 
1、写个单例
/**
.h文件
*/
@interface Singleton : NSObject
+(instancetype) shareInstance ;
@property (nonatomic, assign) CGFloat SafeAreaTopHeightX;//
@property (nonatomic, assign) CGFloat kStatusBarHeightX;//
@property (nonatomic, assign) CGFloat SafeAreaBottomHeightX;//
@end
/**
.m文件
*/
#import "Singleton.h"
static Singleton* _instance = nil;
@implementation Singleton
+(instancetype) shareInstance
{
static dispatch_once_t onceToken ;
dispatch_once(&onceToken, ^{
_instance = [[self alloc] init] ;
}) ;
return _instance ;
}
@end
2、在AppDelegate.m文件中
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
//必须写在这个位置，在window初始化完成时
if (isIPhoneX()==1) {
[Singleton shareInstance].SafeAreaTopHeightX = 88.0f;
[Singleton shareInstance].SafeAreaBottomHeightX = 34.0f;
[Singleton shareInstance].kStatusBarHeightX = 44.0f ;
}else{
[Singleton shareInstance].SafeAreaTopHeightX = 64.0f;
[Singleton shareInstance].SafeAreaBottomHeightX = 0;
[Singleton shareInstance].kStatusBarHeightX = 20.0f ;
}
#pragma mark - 默认加载UI
LoginController *loginVC = [[LoginController alloc] init];
self.window.rootViewController = loginVC;
self.window.rootViewController = mainVC;
return YES;
}
static inline BOOL isIPhoneX() {
BOOL iPhoneX = NO;
/// 先判断设备是否是iPhone/iPod
if (UIDevice.currentDevice.userInterfaceIdiom != UIUserInterfaceIdiomPhone) {
return iPhoneX;
}
if (@available(iOS 11.0, *)) {
/// 利用safeAreaInsets.bottom > 0.0来判断是否是iPhone X。
UIWindow *mainWindow = [[[UIApplication sharedApplication] delegate] window];
if (mainWindow.safeAreaInsets.bottom > 0.0) {
iPhoneX = YES;
}
}
return iPhoneX;
}
3、在.pch文件中 ，这样定义宏
//导航栏高度
#define SafeAreaTopHeight [Singleton shareInstance].SafeAreaTopHeightX
//状态栏
#define kStatusBarHeight [Singleton shareInstance].kStatusBarHeightX
//底部宏
#define SafeAreaBottomHeight [Singleton shareInstance].SafeAreaBottomHeightX