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iOS学习笔记-07必要知识

7.必要知识

7.1 APNS

  • 目前在8.0以后的推送需要以下几个步骤：

    1.使用registerUserNotificationSettings: & registerForRemoteNotifications方法

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    if ([[UIApplication sharedApplication] respondsToSelector:@selector(registerForRemoteNotifications)]) {
         UIUserNotificationSettings* notificationSettings = [UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil];
         [[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings]; 
         [[UIApplication sharedApplication] registerForRemoteNotifications];
    }

关于registerForRemoteNotifications方法有以下说明，它会需要实现两个delegate方法，并且方法能够被执行的条件是通过registerUserNotificationSettings:方法成功注册用户的notification，或者enabled for Background App Refresh。

// Calling this will result in either application:didRegisterForRemoteNotificationsWithDeviceToken: or application:didFailToRegisterForRemoteNotificationsWithError: to be called on the application delegate. Note: these callbacks will be made only if the application has successfully registered for user notifications with registerUserNotificationSettings:, or if it is enabled for Background App Refresh

2.实现delegate方法：每个APP都不同，就不写了。

7.2 block tips

  • 多使用typedef来定义block，因为简洁、可复用、对于结构相同的block可以通过命名来区分。
  • 在定义API时多用handle block来降低代码分散程度。
  • 注意在使用block时循环引用对象 
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#import "BlockHandle.h"
#import <Foundation/Foundation.h>

@interface BlockClass : NSObject

@property (strong, nonatomic) NSData* localData;

@property (strong, nonatomic) BlockHandle* bh;
- (void)download;

@end

#import "BlockClass.h"

@implementation BlockClass

- (void)download
{
    //    BlockHandle* bh
    self.bh = [[BlockHandle alloc] initWithUrl:@""];
    [self.bh startDownloadwithcompletionHandleBlock:^(NSData* data) {
        self.localData = data;
        // 解除引用，打破保留环
        self.bh = nil;
    }];
}

- (void)dealloc
{
    NSLog(@"BlockClass dealloc");
}

@end
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#import <Foundation/Foundation.h>

typedef void (^completionHandleBlock)(NSData* data);

@interface BlockHandle : NSObject
@property (strong, nonatomic) NSString* url;
@property (strong, nonatomic) completionHandleBlock block;

- (id)initWithUrl:(NSString*)url;
- (void)startDownloadwithcompletionHandleBlock:(completionHandleBlock)block;

@end

#import "BlockHandle.h"

@implementation BlockHandle

- (id)initWithUrl:(NSString*)url
{
    self = [super init];
    if (self) {
        self.url = url;
    }
    return self;
}

- (void)startDownloadwithcompletionHandleBlock:(completionHandleBlock)block
{
    self.block = block;
    if (self.block != nil) {
        {
            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                [NSThread sleepForTimeInterval:3];
                self.block(nil);
            });
        }
    }
}

- (void)dealloc
{
    NSLog(@"BlockHandle dealloc");
}

@end
# iOS学习笔记
iOS学习笔记-03UI
iOS学习笔记-08杂
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最新文章

归档

标签

3D数学 1
CPP 8
CPU 1
Engine 2
Java 13
Lua 6
OpenGL 10
PHP 1
UWA 25
Unity3D 29
Unity預計算即時GI 3
VR/AR 3
Vulkan 3
iOS学习笔记 9
并发模型 5
杂记 4
游戏设计模式 8
组成原理 6
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