iOS Development Basics-Fragmentation 7

38: Each version of the iphone resolution and image implementation principle

[Email protected]: IPhone 4s (420) Desert5, 5C and 5S (568 c7>) Desert6 (375667) Desert6+ (414736  ) [email protected]~ipad:ipad (1024x768768)

Interface size ratio:

The principle of image size implementation:

#import <UIKit/UIKit.h>typedef ns_enum (Nsinteger, Thisdeviceclass) {    Thisdeviceclass_iphone,    Thisdeviceclass_iphoneretina,    thisdeviceclass_iphone5,    thisdeviceclass_iphone6,    Thisdeviceclass_ Iphone6plus,    //  We can add new devices when we become aware of them    thisdeviceclass_i Pad,    Thisdeviceclass_ipadretina,    thisdeviceclass_unknown};thisdeviceclass currentdeviceclass (); Interface UIImage (Devicespecificmedia)+ (Instancetype) Imagefordevicewithname: (NSString *) fileName; @end 

#import"uiimage+devicespecificmedia.h"Thisdeviceclass Currentdeviceclass () {cgfloat greaterpixeldimension= (cgfloat) fmaxf ((float) [[UIScreen Mainscreen]bounds].size.height], ((float) [[UIScreen mainscreen]bounds].size.width)]; Switch((Nsinteger) greaterpixeldimension) { Case 480:            return([[[UIScreen Mainscreen]scale] >1.0) ?Thisdeviceclass_iphoneretina:thisdeviceclass_iphone);  Break;  Case 568:            returnThisdeviceclass_iphone5;  Break;  Case 667:            returnThisdeviceclass_iphone6;  Break;  Case 736:            returnThisdeviceclass_iphone6plus;  Break;  Case 1024x768:            return([[[UIScreen Mainscreen]scale] >1.0) ?Thisdeviceclass_ipadretina:thisdeviceclass_ipad);  Break; default:            returnThisdeviceclass_unknown;  Break; }} @implementation UIImage (Devicespecificmedia)+ (NSString *) magicsuffixfordevice{Switch(Currentdeviceclass ()) { CaseThisdeviceclass_iphone:return @"";  Break;  CaseThisdeviceclass_iphoneretina:return @"@2x";  Break;  CaseThisdeviceclass_iphone5:return @"[email protected]";  Break;  CaseThisdeviceclass_iphone6:return @"[email protected]";//or some other arbitrary string:             Break;  CaseThisdeviceclass_iphone6plus:return @"[email protected]";  Break;  CaseThisdeviceclass_ipad:return @"~ipad";  Break;  CaseThisdeviceclass_ipadretina:return @"[email protected]";  Break;  CaseThisdeviceclass_unknown:default:            return @"";  Break; }}+ (Instancetype) Imagefordevicewithname: (NSString *) filename{UIImage*result =Nil; NSString*namewithsuffix =[FileName stringbyappendingstring:[uiimage Magicsuffixfordevice]; Result=[UIImage Imagenamed:namewithsuffix]; if(!result) {Result=[UIImage Imagenamed:filename]; }    returnresult;} @end

39: Several other knowledge pictures

1:nsobject Inheritance class diagram

2:sqlite3 return meaning

3: View coordinate description

4: Life cycle diagram

5:ui inheritance Diagram

6:segue list jump, about the difference between selection and accessory

iOS Development Basics-Fragmentation 7