小编Mit*_*try的帖子

MKPinAnnotationView引脚的宽度和高度(以像素为单位)是多少？

编辑:更具体地说,iPhone屏幕上包含引脚的虚构矩形的宽度和高度.

这段代码

NSCalendar *calendar =[NSCalendar currentCalendar];
[gregorian setTimeZone:tz];

NSLog(@"%@", [gregorian timeZone]);

NSDateComponents *comp = [gregorian components:(NSYearCalendarUnit | NSMonthCalendarUnit) fromDate:[NSDate date]];

[comp setDay:info.day];
[comp setMonth:info.month];
[comp setYear:info.year];
[comp setHour:info.hour];
[comp setMinute:info.minute];
[comp setSecond:info.second];
[comp setTimeZone:tz];  

NSLog(@"%@", [comp timeZone]);
NSLog(@"%@", [gregorian dateFromComponents:comp]);

在控制台中显示以下内容:

Europe/Moscow (MSKS) offset 14400 (Daylight)

Europe/Moscow (MSKS) offset 14400 (Daylight)

2011-08-31 20:00:00 +0000

因此,正确指定了日历和组件的时区,但[gregorian dateFromComponents:comp]返回带有错误时区(GMT)的NSDate值.

我需要纠正什么才能获得合适的时区？

我UIMapView按照这个问题的接受答案中描述的方式实现了手势识别器:如何拦截触摸MKMapView或UIWebView对象上的事件？

可以正确识别单个触摸.然而,当我改变了我的类的超从UIGestureRecognizer到UIPinchGestureRecognizer以识别地图缩放,一切都停止了工作.现在只有当用户双击地图上的注释时才会发生TouchesEnded事件(不知道,为什么!)并且当用户捏住地图时不会发生(放大或缩小无关紧要).

PS我正在使用iOS SDK 4.3并在模拟器中测试我的应用程序,如果这很重要.

mapViewController.m的代码 - viewDidLoad方法:

 - (void)viewDidLoad
 {
     [super viewDidLoad];
     MapGestureRecognizer *changeMapPositionRecognizer = [[MapGestureRecognizer alloc] init];
     changeMapPositionRecognizer.touchesEndedCallback = ^(NSSet * touches, UIEvent * event) 
     {
        ...
     };
     [self.mapView addGestureRecognizer:changeMapPositionRecognizer];
     [changeMapPositionRecognizer release];
}

MapGestureRecognizer.h的代码:

#import <UIKit/UIKit.h>
typedef void (^TouchesEventBlock) (NSSet * touches, UIEvent * event);
@interface MapGestureRecognizer : UIPinchGestureRecognizer    
@property(nonatomic, copy) TouchesEventBlock touchesEndedCallback;
@end

MapGestureRecognizer.m的代码:

#import "MapGestureRecognizer.h"

@implementation MapGestureRecognizer
@synthesize touchesEndedCallback = _touchesEndedCallback;

- (id)init
{
    self = [super …