iPhone开发笔记（三）

11、iPhone中变量值是否等于字符串的判断方法：

Objective-C代码

[string1 isEqualToString:@
"123 "
];

12、iPhone的Framework的目录：
Mac---Developer---Platforms---iPhoneOS.platform---Developer---SDKs---iPhoneOS3.1.3.sdk---System---Library---Frameworks

  13、在iPhone中设置googlemap的经纬度：

Objective-C代码

CLLocationCoordinate2D centerCoordinate;
centerCoordinate.latitude = 39.9097;
centerCoordinate.longitude = 105.3476;
MKCoordinateSpan span;
span.latitudeDelta = 30;
span.longitudeDelta = 30;
MKCoordinateRegion region;
region.center = centerCoordinate;
region.span = span;
[mapview setRegion:region animated:TRUE];

14、翻页过渡效果：

Objective-C代码

- (IBAction)backToMenus:(id)sender {
    CATransition *transition = [CATransition animation];
    transition.duration = 0.5;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
    transition.type = kCATransitionFade;
    transition.delegate = self;
    [self.view.superview.layer addAnimation:transition forKey:nil];
    [self.view removeFromSuperview];
}

15、fathercontroller的写法：

Objective-C代码

在.h中：
#import "DataBaseVC.h"
@class
 DataBaseVC;
DataBaseVC *databasevc;
在.m中：
databasevc = [[DataBaseVC alloc] init];

16、将NSData类型的数据转换成NSString：

Objective-C代码

NSString *theXML = [[NSString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding]; 
//webData为NSData类型

17、将NSString类型的数据转换成NSData：

Objective-C代码

NSData *webData = [NSMutableData dataWithBytes:[theXML UTF8String] length:[theXML length]];; 
//theXML为NSString类型

18、将特殊字符转义：

Objective-C代码

NSString *str2 = [str1 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

19、WiFi提示：

Objective-C代码

在p-list中添加如下内容：
Application uses Wi-Fi   YES
SBUsesNetwork  3

20、iPhone获取系统时间：

Objective-C代码

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"YYYYMMddhhmmss"
];
NSString *locationString=[formatter stringFromDate: [NSDate date]];