[iPhone]Core-Plot的Theme樣式

kCPTDarkGradientTheme

 kCPTPlainBlackTheme

 kCPTPlainWhiteTheme

 kCPTSlateTheme

 kCPTStocksTheme

[iPhone]Core-Plot的使用

找到一個統計圖的Open Source Core-plot，
http://code.google.com/p/core-plot/

提供了折線圖、pie chart和bar chart等等...

如何在自己project中使用這個open source呢，
首先先把core-plot download下來，
1. 把Binaries >IOS內的 CorePlotHeaders 資料夾和libCorePlot-CocoaTouch.a拉近Project內，
2. 把內建的QuartzCore.framework加入peoject
3. 在Project Info裡面，Other Linker Flags內加入"-ObjC"，如果是非Xcode4.2的版本則要加入"-all_load"

接下來就可以順利使用Core-Plot囉！

[iPhone]使用NSUserDefaults將自定義的Object存入手機

首先在自己的Object中加上

@interface YourObject : NSObject<NSCoding>

{
    NSString *string_a;
    NSString *string_b;

    int int_c;

}

然後在這個Object中加上encoderWithObject:和initWithObject:兩個方法

-(void)encodeWithCoder:(NSCoder *)encoder

{
   [encoder encodeObject:string_a forKey:@"string_a"];
   [encoder encodeObject:string_b forKey:@"string_b"];

   [encoder encodeInt:int_c forKey:@"int_c"];

}

-(id)initWithCoder:(NSCoder *)decoder

{
    self.string_a = [decoder decodeObjectForKey: @"string_a"];
    self.string_b = [decoder decodeObjectForKey: @"string_b"];
    self.int_c = [decoder decodeObjectForKey:@"int_c"];
    return self;
}

存入的方法

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

YourObject *obj = [[YourObject alloc]init];
NSMutableArray *arr = [[NSMutableArray alloc]initWithObject:obj,nil];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arr];
[defaults setObject:data forKey:@"theKey"];

讀取的方法

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *data = [defaults objectForKey:@"theKey"];
NSArray *arr = [NSKeyedUnarchiver unarchiveObjectWithData:data];