iOS8 新特性

iOS8新特性主要体现在4方面

1.UIAlertController 对alert&actionSheet的封装

UIAlertController.h

提示框按钮的选择

typedef NS_ENUM(NSInteger, UIAlertActionStyle) {

UIAlertActionStyleDefault = 0,

UIAlertActionStyleCancel,

UIAlertActionStyleDestructive

} NS_ENUM_AVAILABLE_IOS(8_0);

提示框的样式

typedef NS_ENUM(NSInteger, UIAlertControllerStyle) {

UIAlertControllerStyleActionSheet = 0,

UIAlertControllerStyleAlert

} NS_ENUM_AVAILABLE_IOS(8_0);

NS_CLASS_AVAILABLE_IOS(8_0) @interface UIAlertAction : NSObject <NSCopying>

创建提示框按钮

+ (instancetype)actionWithTitle:(NSString *)title style:(UIAlertActionStyle)style handler:(void (^)(UIAlertAction *action))handler;

@property (nonatomic, readonly) NSString *title;

@property (nonatomic, readonly) UIAlertActionStyle style;

@property (nonatomic, getter=isEnabled) BOOL enabled;

@end

NS_CLASS_AVAILABLE_IOS(8_0) @interface UIAlertController : UIViewController

创建提示框

+ (instancetype)alertControllerWithTitle:(NSString *)title message:(NSString *)message preferredStyle:(UIAlertControllerStyle)preferredStyle;

添加按钮

- (void)addAction:(UIAlertAction *)action;

@property (nonatomic, readonly) NSArray *actions;

添加文本输入框

- (void)addTextFieldWithConfigurationHandler:(void (^)(UITextField *textField))configurationHandler;

@property (nonatomic, readonly) NSArray *textFields;

@property (nonatomic, copy) NSString *title;

@property (nonatomic, copy) NSString *message;

@property (nonatomic, readonly) UIAlertControllerStyle preferredStyle;

简单实用示例

//    1.创建提示框对象，默认是actionSheet效果

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"注意" message:@"我的呈现方式变了" preferredStyle:UIAlertControllerStyleAlert];

//    2.创建取消按钮并添加到提示框上

[alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {

NSLog(@"取消按钮被点击了");

}]];

//    3.呈现提示框

[self presentViewController:alert animated:YES completion:nil];

2.UIPopoverController的呈现方式改变不必再像之前那样，直接通过present方式呈现

UIViewController.h

typedef NS_ENUM(NSInteger, UIModalPresentationStyle) {

UIModalPresentationFullScreen = 0,

UIModalPresentationPageSheet NS_ENUM_AVAILABLE_IOS(3_2),

UIModalPresentationFormSheet NS_ENUM_AVAILABLE_IOS(3_2),

UIModalPresentationCurrentContext NS_ENUM_AVAILABLE_IOS(3_2),

UIModalPresentationCustom NS_ENUM_AVAILABLE_IOS(7_0),

UIModalPresentationOverFullScreen NS_ENUM_AVAILABLE_IOS(8_0),

UIModalPresentationOverCurrentContext NS_ENUM_AVAILABLE_IOS(8_0),

UIModalPresentationPopover NS_ENUM_AVAILABLE_IOS(8_0),

UIModalPresentationNone NS_ENUM_AVAILABLE_IOS(7_0) = -1,

};

@property (nonatomic,readonly) UIPopoverPresentationController *popoverPresentationController NS_AVAILABLE_IOS(8_0);

使用示例

//   1.创建内容控制器

UITableViewController *contentVc = [[UITableViewController alloc] init];

//   2.1 设置呈现方式

contentVc.modalPresentationStyle = UIModalPresentationPopover;

//   2.2设置在导航栏的左边按钮呈现

contentVc.popoverPresentationController.barButtonItem = self.navigationItem.leftBarButtonItem;

//    3.呈现

[self presentViewController:contentVc animated:YES completion:nil];

以前的方式

// 1.创建内容控制器

UITableViewController *contentVc = [[UITableViewController alloc] init];

// 2.创建popover

UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:contentVc];

popover.popoverContentSize = CGSizeMake(100, 100);

// 3.呈现

[popover presentPopoverFromBarButtonItem:self.navigationItem.leftBarButtonItem permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

3.获取用户授权的用户隐私保护

地图定位示例：

//导入定位框架

#import <CoreLocation/CoreLocation.h>

@interface ViewController ()<CLLocationManagerDelegate>

//设置定位对象

@property(nonatomic,strong)CLLocationManager* maneger;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

//    当使用iOS8定位的时候需要请求用户授权，且在info.plist里添加字段NSLocationAlwaysUsageDescription 请求用户授权的描述

//    iOS7仅仅需要在info.plist里添加字段Privacy - Location Usage Description 请求用户授权的描述

//    不需要再写下面的代码

if (IOS8) {

[self.maneger requestAlwaysAuthorization];//请求用户授权

}

//    开启定位

[self.maneger startUpdatingLocation];

}

4.针对屏幕适配应运而生的size classes

size classes是为了解决storyboard只能订制一种屏幕样式的问题，它不再是具体的尺寸，而是抽象尺寸

通过宽/高 的compact any regular 组成了九种组合包含了所有苹果设备的尺寸

详情 ：http://www.cnblogs.com/lijianyi/p/4288462.html