[IOS] APP code practice: Create an auxiliary APP class to reduce modifications to AppDelegate

[IOS] APP code practice: Create an auxiliary APP class to reduce modifications to AppDelegate

When I first started iOS development, if I needed some global variables or global functionsAppDelegateBecauseAppDelegateCan be obtained directly

[UIApplication sharedApplication].delegate

However, after a long time, I still think this is not good,AppDelegateIt has its own role (to process some events of the App, such as start, switch, and push). This is strange, therefore, it is better to create an object that specifically handles global brightening or global functions we need.

//APPHelper.h@interface APPHelper+ (APPHelper*)call;- (void) configureWindow:(UIWindow*)window;@property (nonatomic, readonly) AppDelegate *delegate;@property (strong, readonly) UIWindow *window;@end//APPHelper.m@interface APPHelper ()@end@implementation APPHelper- (id)init{    self = [super init];    if (self) {                _delegate = (GGAppDelegate*)[UIApplication sharedApplication].delegate;    }    return self;}+ (APPHelper *)call{    static dispatch_once_t  onceQueue;    static APPHelper *appInstance;    dispatch_once(&onceQueue, ^{        appInstance = [[APPHelper alloc] init];    });    return appInstance;}- (UIWindow *)window{    return self.delegate.window;}- (void)configureWindow:(UIWindow*)window{        UINavigationController *nav = [[UINavigationController alloc] init];    ...    ...    ...        window.rootViewController = nav;    }@end

 

Then in the pre-compiled Header*.pchJoin

#import "AppHelper.h"#define APP ([APPHelper call])

 

This class can be directly used in any part of the Code, such

// Set APP to rounded corner APP. window. layer. cornerRadius = 5.0f; APP. window. layer. masksToBounds = YES;