适配iOS 的东西程序员iOS Developer

Xcode9新特性/iOS11适配-收编

2017-10-19  本文已影响518人  百草纪

更新中......(部分省略)

10.19已更新
10.20已更新
11.4 已更新

Xcode9新特性

1.启动多个模拟器

方案一

  • 从Xcode选择不同的模拟器，启动新的模拟器。

方案二

  • 从模拟器 menu 上的 Hardware---Device，选择新的模拟器启动。
    u=2475746809,941184978&fm=173&s=00095C320EB7729A8761914D0300B0F1&w=640&h=455&img.JPEG

2.WiFi无线安装App

3.错误提示

4.按住 command 加+可将代码放大，command 加-可将代码縮小。

5.提示选单

6.swift重新命名、自动补全协议的required方法，Extract Method自动提取方法

7.深度整合 github

8.给顏色添加名字

9.新的编译系统

10.Finder 和 Simulator 共享文件

11.折叠代码

20170926164432230.jpeg

12.Folder和Group的同步问题

iOS11适配

1.定位相关

2.系统相册相关(待验证)

3.关于UIScrollView初始位置变化的问题

// Swift
if #available(iOS 11.0, *) {
    UIScrollView.appearance().contentInsetAdjustmentBehavior = .never
}

// OC
if (@available(iOS 11.0, *)) {
    [UIScrollView appearance].contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    [UITableView appearance].contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    [UICollectionView appearance].contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    [UIWebView appearance].scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    //底下这三句是解决mjrefresh 上拉偏移的bug
    [UITableView appearance].estimatedRowHeight = 0;
    [UITableView appearance].estimatedSectionHeaderHeight = 0;
    [UITableView appearance].estimatedSectionFooterHeight = 0;
} else {
    // Fallback on earlier versions
}
    
// 或者
#ifdef __IPHONE_11_0   
#endif
  
  
    if (UIScreen.mainScreen.bounds.size.height == 812) {
      NSLog(@"this is iPhone X");
    }
}

4.UIVisualEffectView相关的崩溃

5.关于上传商店相关改变

6.针对 iPhoneX启动图 适配

7.iOS11 安全区域 适配

iOS11的UIViewController和UIView新加了-(void)viewSafeAreaInsetsDidChange方法，当安全区域改变后该方法会被调用。然后在该方法中根据safeAreaInses属性更新子视图中控件的布局位置。
当然如果你要改变一个UIViewController的safeAreaInsets值, 可以通过设置addtionalSafeAreaInsets属性来实现, 例如你要自定义一些特殊的样式时。
需要注意的是 viewSafeAreaInsetsDidChange 在UIViewController 中第一次调用的时间是在 -(void)viewWillAppear:(BOOL)animated 调用之后, 在 - (void)viewWillLayoutSubviews 调用之前。所以可以在 viewWillAppear 里设置受影响的页面的 addtionalSafeAreaInsets 属性。
  
- (void)viewSafeAreaInsetsDidChange{
    [super viewSafeAreaInsetsDidChange];
    if (@available(iOS 11.0, *)) {
        NSLog(@"safeAreaInset list= %@",NSStringFromUIEdgeInsets(self.view.safeAreaInsets));
        NSLog(@"safeAreaLayout list= %@",self.view.safeAreaLayoutGuide);
    }
}

8.导航栏高度的变化

9. UITableView

tableView.estimatedRowHeight = 0;
tableView.estimatedSectionHeaderHeight = 0;
tableView.estimatedSectionFooterHeight = 0;

官方视频总结

1.iOS9 and later

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2.

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3.

Snip20171019_14.png
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4.

Snip20171019_15.png
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5.新方法介绍

UIBarButtonItem的方法
largeContentSizeImage   用于视觉障碍的用户显示的图像。
landscapeImagePhone     用于以横向方向表示项目的图像。
navigationBar.prefersLargeTitles 标题是否应以大格式显示。
navigationItem.largeTitleDisplayMode 显示导航栏的标题时使用的模式。
navigationItem.searchController 搜索控制器集成到您的导航界面
navigationItem.hidesSearchBarWhenScrolling  在滚动任何底层内容时是否隐藏综合搜索栏。
UIView的方法
layoutMarginsGuide 表示视图边缘的布局指南。(iOS9的方法)
directionalLayoutMargins 在视图中布局内容时使用的默认间距，同时考虑到当前的语言方向。
控制器的方法
viewRespectsSystemMinimumLayoutMargins 如果你设置该属性为"false"，你就可以改变你的layout margins为任意你想设置的值，包括0
...

自己适配问题

1.导航条

- (CGSize)intrinsicContentSize {
    return UILayoutFittingExpandedSize;
}

2.TZImagePickerController iPhoneX适配问题

Snip20171020_3.png
Snip20171020_1.png Snip20171020_4.png

3.iPhoneX跳转页面时tabbar上移问题

#pragma mark - Override Methods
- (void)setFrame:(CGRect)frame
{
    if (self.superview &&CGRectGetMaxY(self.superview.bounds) !=CGRectGetMaxY(frame)) {
        frame.origin.y =CGRectGetHeight(self.superview.bounds) -CGRectGetHeight(frame);
    }
    [super setFrame:frame];
}

#pragma mark - Initial Methods
- (instancetype)initWithFrame:(CGRect)frame
{
    self = [superinitWithFrame:frame];
    if (self) {
        self.translucent =false;
        self.backgroundColor = [UIColorwhiteColor];
    }
    return self;
}

[self setValue:[[CustomTabBar alloc]init]forKey:@"tabBar"];

4.加载 UIImagePickerController 时，图片列表被导航条遮挡

// 由于这句代码的原因
if #available(iOS 11.0, *) {
    UITableView.appearance().contentInsetAdjustmentBehavior = .never
    UICollectionView.appearance().contentInsetAdjustmentBehavior = .never
}

谢谢DeviceUitility 

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface DeviceUitility : NSObject
/// 屏幕宽度
+ (CGFloat)getDeviceScreenWidth;
/// 屏幕高度
+ (CGFloat)getDeviceScreenHeight;

/// 获取设备型号然后手动转化为对应名称
- (NSString *)getDeviceName;

/// 获取iPhone名称
+ (NSString *)getiPhoneName;

/// 获取app版本号
+ (NSString *)getAPPVerion;

/// 获取电池电量
+ (CGFloat)getBatteryLevel;
/// 当前系统名称
+ (NSString *)getSystemName ;

/// 当前系统版本号
+ (NSString *)getSystemVersion;

/// 通用唯一识别码UUID
+ (NSString *)getUUID;
// 获取当前设备IP
+ (NSString *)getDeviceIPAdress;
/// 获取精准电池电量
+ (CGFloat)getCurrentBatteryLevel;

/// 获取电池当前的状态，共有4种状态
+ (NSString *) getBatteryState;
/// 获取当前语言
+ (NSString *)getDeviceLanguage;

/// CPU总数目
+ (NSUInteger)getCPUCount;
/// 获取磁盘总空间
+ (int64_t)getTotalDiskSpace;
/// 获取未使用的磁盘空间
+ (int64_t)getFreeDiskSpace;
/// 获取已使用的磁盘空间
+ (int64_t)getUsedDiskSpace;
/// 系统总内存空间
+ (int64_t)getTotalMemory;
/// 活跃的内存,正在使用或者很短时间内被使用过
+ (int64_t)getActiveMemory;
/// 最近使用过,但是目前处于不活跃状态的内存
+ (int64_t)getInActiveMemory;

/// 空闲的内存空间
+ (int64_t)getFreeMemory;

/// 已使用的内存空间
+ (int64_t)getUsedMemory;

/// 用来存放内核和数据结构的内存,framework、用户级别的应用无法分配
+ (int64_t)getWiredMemory;

/// 可释放的内存空间：内存吃紧自动释放，针对大对象存放所需的大块内存空间
+ (int64_t)getPurgableMemory;
@end

// ----------------------------------.m----------------------------------------
#import "DeviceUitility.h"
#import <sys/utsname.h>
#import <ifaddrs.h>
#import <arpa/inet.h>
#import <mach/mach.h>
#import <objc/runtime.h>

@implementation DeviceUitility
/// 屏幕宽度
+ (CGFloat)getDeviceScreenWidth {
    return [UIScreen mainScreen].bounds.size.width;
}
/// 屏幕高度
+ (CGFloat)getDeviceScreenHeight {
    return [UIScreen mainScreen].bounds.size.height;
}

// 获取设备型号然后手动转化为对应名称
- (NSString *)getDeviceName
{
    // 需要#import "sys/utsname.h"
    struct utsname systemInfo;
    uname(&systemInfo);
    NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
    
    if ([deviceString isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
    if ([deviceString isEqualToString:@"iPhone3,2"])    return @"iPhone 4";
    if ([deviceString isEqualToString:@"iPhone3,3"])    return @"iPhone 4";
    if ([deviceString isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([deviceString isEqualToString:@"iPhone5,1"])    return @"iPhone 5";
    if ([deviceString isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
    if ([deviceString isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
    if ([deviceString isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
    if ([deviceString isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
    if ([deviceString isEqualToString:@"iPhone8,1"])    return @"iPhone 6s";
    if ([deviceString isEqualToString:@"iPhone8,2"])    return @"iPhone 6s Plus";
    if ([deviceString isEqualToString:@"iPhone8,4"])    return @"iPhone SE";
    // 日行两款手机型号均为日本独占，可能使用索尼FeliCa支付方案而不是苹果支付
    if ([deviceString isEqualToString:@"iPhone9,1"])    return @"iPhone 7";
    if ([deviceString isEqualToString:@"iPhone9,2"])    return @"iPhone 7 Plus";
    if ([deviceString isEqualToString:@"iPhone9,3"])    return @"iPhone 7";
    if ([deviceString isEqualToString:@"iPhone9,4"])    return @"iPhone 7 Plus";
    if ([deviceString isEqualToString:@"iPhone10,1"])   return @"iPhone_8";
    if ([deviceString isEqualToString:@"iPhone10,4"])   return @"iPhone_8";
    if ([deviceString isEqualToString:@"iPhone10,2"])   return @"iPhone_8_Plus";
    if ([deviceString isEqualToString:@"iPhone10,5"])   return @"iPhone_8_Plus";
    if ([deviceString isEqualToString:@"iPhone10,3"])   return @"iPhone_X";
    if ([deviceString isEqualToString:@"iPhone10,6"])   return @"iPhone_X";
    
    if ([deviceString isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";
    if ([deviceString isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";
    if ([deviceString isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";
    if ([deviceString isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";
    if ([deviceString isEqualToString:@"iPod5,1"])      return @"iPod Touch (5 Gen)";
    
    if ([deviceString isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([deviceString isEqualToString:@"iPad1,2"])      return @"iPad 3G";
    if ([deviceString isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
    if ([deviceString isEqualToString:@"iPad2,2"])      return @"iPad 2";
    if ([deviceString isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
    if ([deviceString isEqualToString:@"iPad2,4"])      return @"iPad 2";
    if ([deviceString isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
    if ([deviceString isEqualToString:@"iPad2,6"])      return @"iPad Mini";
    if ([deviceString isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
    if ([deviceString isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPad3,3"])      return @"iPad 3";
    if ([deviceString isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
    if ([deviceString isEqualToString:@"iPad3,5"])      return @"iPad 4";
    if ([deviceString isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";
    if ([deviceString isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";
    if ([deviceString isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
    if ([deviceString isEqualToString:@"iPad4,4"])      return @"iPad Mini 2 (WiFi)";
    if ([deviceString isEqualToString:@"iPad4,5"])      return @"iPad Mini 2 (Cellular)";
    if ([deviceString isEqualToString:@"iPad4,6"])      return @"iPad Mini 2";
    if ([deviceString isEqualToString:@"iPad4,7"])      return @"iPad Mini 3";
    if ([deviceString isEqualToString:@"iPad4,8"])      return @"iPad Mini 3";
    if ([deviceString isEqualToString:@"iPad4,9"])      return @"iPad Mini 3";
    if ([deviceString isEqualToString:@"iPad5,1"])      return @"iPad Mini 4 (WiFi)";
    if ([deviceString isEqualToString:@"iPad5,2"])      return @"iPad Mini 4 (LTE)";
    if ([deviceString isEqualToString:@"iPad5,3"])      return @"iPad Air 2";
    if ([deviceString isEqualToString:@"iPad5,4"])      return @"iPad Air 2";
    if ([deviceString isEqualToString:@"iPad6,3"])      return @"iPad Pro 9.7";
    if ([deviceString isEqualToString:@"iPad6,4"])      return @"iPad Pro 9.7";
    if ([deviceString isEqualToString:@"iPad6,7"])      return @"iPad Pro 12.9";
    if ([deviceString isEqualToString:@"iPad6,8"])      return @"iPad Pro 12.9";
    
    if ([deviceString isEqualToString:@"AppleTV2,1"])      return @"Apple TV 2";
    if ([deviceString isEqualToString:@"AppleTV3,1"])      return @"Apple TV 3";
    if ([deviceString isEqualToString:@"AppleTV3,2"])      return @"Apple TV 3";
    if ([deviceString isEqualToString:@"AppleTV5,3"])      return @"Apple TV 4";
    
    if ([deviceString isEqualToString:@"i386"])         return @"Simulator";
    if ([deviceString isEqualToString:@"x86_64"])       return @"Simulator";
    
    return deviceString;
}


/// 获取iPhone名称
+ (NSString *)getiPhoneName {
    return [UIDevice currentDevice].name;
}

/// 获取app版本号
+ (NSString *)getAPPVerion {
    return [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
}

/// 获取电池电量
+ (CGFloat)getBatteryLevel {
    return [UIDevice currentDevice].batteryLevel;
}
/// 当前系统名称
+ (NSString *)getSystemName {
    return [UIDevice currentDevice].systemName;
}

/// 当前系统版本号
+ (NSString *)getSystemVersion {
    return [UIDevice currentDevice].systemVersion;
}

/// 通用唯一识别码UUID
+ (NSString *)getUUID {
    return [[UIDevice currentDevice] identifierForVendor].UUIDString;
}

// 获取当前设备IP
+ (NSString *)getDeviceIPAdress {
    NSString *address = @"an error occurred when obtaining ip address";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    success = getifaddrs(&interfaces);
    if (success == 0) { // 0 表示获取成功
        temp_addr = interfaces;
        while (temp_addr != NULL) {
            if( temp_addr->ifa_addr->sa_family == AF_INET) {
                // Check if interface is en0 which is the wifi connection on the iPhone
                if ([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                    // Get NSString from C String
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }
            temp_addr = temp_addr->ifa_next;
        }
    }
    freeifaddrs(interfaces);
    return address;
}

/// 获取总内存大小
+ (long long)getTotalMemorySize {
    return [NSProcessInfo processInfo].physicalMemory;
}

/// 获取当前可用内存
+ (long long)getAvailableMemorySize {
    vm_statistics_data_t vmStats;
    mach_msg_type_number_t infoCount = HOST_VM_INFO_COUNT;
    kern_return_t kernReturn = host_statistics(mach_host_self(), HOST_VM_INFO, (host_info_t)&vmStats, &infoCount);
    if (kernReturn != KERN_SUCCESS)
    {
        return NSNotFound;
    }
    return ((vm_page_size * vmStats.free_count + vm_page_size * vmStats.inactive_count));
}

/// 获取精准电池电量
+ (CGFloat)getCurrentBatteryLevel {
    UIApplication *app = [UIApplication sharedApplication];
    if (app.applicationState == UIApplicationStateActive||app.applicationState==UIApplicationStateInactive) {
        Ivar ivar=  class_getInstanceVariable([app class],"_statusBar");
        id status  = object_getIvar(app, ivar);
        for (id aview in [status subviews]) {
            int batteryLevel = 0;
            for (id bview in [aview subviews]) {
                if ([NSStringFromClass([bview class]) caseInsensitiveCompare:@"UIStatusBarBatteryItemView"] == NSOrderedSame&&[[[UIDevice currentDevice] systemVersion] floatValue] >=6.0) {
                    Ivar ivar=  class_getInstanceVariable([bview class],"_capacity");
                    if(ivar) {
                        batteryLevel = ((int (*)(id, Ivar))object_getIvar)(bview, ivar);
                        if (batteryLevel > 0 && batteryLevel <= 100) {
                            return batteryLevel;
                        } else {
                            return 0;
                        }
                    }
                }
            }
        }
    }
    return 0;
}

/// 获取电池当前的状态，共有4种状态
+ (NSString *) getBatteryState {
    UIDevice *device = [UIDevice currentDevice];
    if (device.batteryState == UIDeviceBatteryStateUnknown) {
        return @"UnKnow";
    } else if (device.batteryState == UIDeviceBatteryStateUnplugged){
        return @"Unplugged";
    } else if (device.batteryState == UIDeviceBatteryStateCharging){
        return @"Charging";
    } else if (device.batteryState == UIDeviceBatteryStateFull){
        return @"Full";
    }
    return nil;
}

/// 获取当前语言
+ (NSString *)getDeviceLanguage {
    NSArray *languageArray = [NSLocale preferredLanguages];
    return [languageArray objectAtIndex:0];
}


// CPU总数目
+ (NSUInteger)getCPUCount {
    return [NSProcessInfo processInfo].activeProcessorCount;
}

// 获取磁盘总空间
+ (int64_t)getTotalDiskSpace {
    NSError *error = nil;
    NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
    if (error) return -1;
    int64_t space =  [[attrs objectForKey:NSFileSystemSize] longLongValue];
    if (space < 0) space = -1;
    return space;
}
// 获取未使用的磁盘空间
+ (int64_t)getFreeDiskSpace {
    NSError *error = nil;
    NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
    if (error) return -1;
    int64_t space =  [[attrs objectForKey:NSFileSystemFreeSize] longLongValue];
    if (space < 0) space = -1;
    return space;
}
// 获取已使用的磁盘空间
+ (int64_t)getUsedDiskSpace {
    int64_t totalDisk = [self getTotalDiskSpace];
    int64_t freeDisk = [self getFreeDiskSpace];
    if (totalDisk < 0 || freeDisk < 0) return -1;
    int64_t usedDisk = totalDisk - freeDisk;
    if (usedDisk < 0) usedDisk = -1;
    return usedDisk;
}

// 系统总内存空间
+ (int64_t)getTotalMemory {
    int64_t totalMemory = [[NSProcessInfo processInfo] physicalMemory];
    if (totalMemory < -1) totalMemory = -1;
    return totalMemory;
}

// 活跃的内存,正在使用或者很短时间内被使用过
+ (int64_t)getActiveMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return vm_stat.active_count * page_size;
}

// 最近使用过,但是目前处于不活跃状态的内存
+ (int64_t)getInActiveMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return vm_stat.inactive_count * page_size;
}

// 空闲的内存空间
+ (int64_t)getFreeMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return vm_stat.free_count * page_size;
}

// 已使用的内存空间
+ (int64_t)getUsedMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return page_size * (vm_stat.active_count + vm_stat.inactive_count + vm_stat.wire_count);
}

// 用来存放内核和数据结构的内存,framework、用户级别的应用无法分配
+ (int64_t)getWiredMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return vm_stat.wire_count * page_size;
}

// 可释放的内存空间：内存吃紧自动释放，针对大对象存放所需的大块内存空间
+(int64_t)getPurgableMemory {
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t page_size;
    vm_statistics_data_t vm_stat;
    kern_return_t kern;
    
    kern = host_page_size(host_port, &page_size);
    if (kern != KERN_SUCCESS) return -1;
    kern = host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
    if (kern != KERN_SUCCESS) return -1;
    return vm_stat.purgeable_count * page_size;
}
@end
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