About iOS small points of knowledge

Because it is a random point of knowledge, not according to a certain aspect to write.

1. About Xcode6 Simulator keyboard does not eject with Command + Shift + K

2. About calling the Clipboard copy string

+ (void) Copytextwithstr: (NSString *) str {    Uipasteboard *pasteboard = [Uipasteboard Generalpasteboard];    Copy to clipboard    pasteboard.string = str;}

3. Set 16 color

+ (Uicolor *) Colorwithrgbhex: (UInt32) hex {int r = (hex >>) & 0xff;int g = (hex >> 8) & 0xff;int B = (hex) & 0xff;return [Uicolor colorwithred:r/255.0f   green:g/255.0fblue:b/255.0f   alpha:1.0f];}

4. Print Log

#define DLOG (FMT, ...) NSLog (@ "%s [line%d]" FMT), __pretty_function__, __line__, # #__VA_ARGS__);

5. Define Window/appdelegate

#define Application ([uiapplication sharedapplication]) #define WINDOW ([[UIApplication sharedapplication].windows Lastobject])

6. Set IOS6/IOS7. The height of the navigation bar

#define NAV_H 44#define top_y (ios_7 64:nav_h) #define TOP_TABLE_VIEW_H ((ios_7? 64:nav_h) + Nav_h)

7.UIImage Cutting Circle

+ (uiimage*) Circleimage: (uiimage*) Image withparam: (cgfloat) inset withframe: (cgrect) frame{cgimageref imageref = image .    Cgimage;    Cgimageref resultimgref = Cgimagecreatewithimageinrect (Imageref, frame);    UIImage *resultimg = [UIImage imagewithcgimage:resultimgref scale:image.scale orientation:image.imageOrientation];        Cgimagerelease (RESULTIMGREF);        Uigraphicsbeginimagecontext (resultimg.size); Cgcontextref context = Uigraphicsgetcurrentcontext ();//Cgcontextsetlinewidth (context, 1);//Cgcontextsetstrokecolor Withcolor (context, [Uicolor Clearcolor].    Cgcolor);        CGRect rect = CGRectMake (inset, inset, Resultimg.size.width-inset, Resultimg.size.height-inset);    Cgcontextaddellipseinrect (context, rect);        Cgcontextclip (context);    [Resultimg Drawinrect:rect];    Cgcontextaddellipseinrect (context, rect);//Cgcontextstrokepath (context);    UIImage *newimg = Uigraphicsgetimagefromcurrentimagecontext ();        Uigraphicsendimagecontext (); ReTurn newimg;} 

8.MD5 encryption

-(NSString *) MD5 {    const char *cstr = [self utf8string];    unsigned char result[16];    CC_MD5 (CStr, (UInt32) strlen (CSTR), result);    return [NSString stringWithFormat:            @ "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",            Result[0], result[1], result[2], result[3],            result[4], result[5], result[6], result[7],            result[8], result[9], RESULT[10], result[11],            result[12], result[13], result[14], result[15]            ];}

About iOS small points of knowledge