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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
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原文地址：http://www.cnblogs.com/lijianyi/p/4294108.html
