By Kyle Begeman
Unharness the recent good points of iOS 7 in the most modern Xcode improvement atmosphere. probably the most very important items of any SDK is the built-in improvement atmosphere (IDE), that's why we'll commence by way of studying the entire new positive aspects of Xcode five. in addition, we'll get to grasp what's new in origin Framework, one of many construction blocks of iOS improvement. We then movement directly to exploring the recent and enhanced vehicle structure, a function that was once formerly tormented by various concerns and avoided by way of many builders. subsequent, we are going to commence development our program from scratch whereas utilizing our new wisdom of the IDE. additionally, we'll utilize the newly brought TextKit to make our textual content extra dynamic in nature. eventually, we are going to make the most of the UI equipment Dynamics to provide our program a few flair.
This e-book is a realistic breakdown of the entire new iOS 7 gains for builders.
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Extra resources for Application Development in iOS 7
5 BG Screen Data Format A BG screen is considered to be the 8 x 8 dot unit that represents the size of the basic character, and the BG screen data specifies the characters that are arranged. BG screen data should be stored, beginning from the starting address of the BG screen base block specified in the BG control register. The number of screen data items specified per BG depends on the screen size setting in the BG control register. BG screen data for text and rotation/scaling screens are specified in the following formats.
07 06 05 04 03 02 01 00 Character Name [Cautions for VRAM] AGB provides a high degree of freedom in using the BG area of VRAM. Consequently, in managing VRAM, the following points deserve particular attention. 1. There are 2 formats for BG character data (defined by 16 and 256 colors), and these can be used together. 2. The BG character data base block can be selected from among 4 blocks (BG control register). 3. The BG screen data base block can be selected from among 32 blocks (BG control register).
7 BG Rotation and Scaling Features Rotation and scaling of the BG as a whole can be performed in a rotation/scaling BG screen. With rotation, BG data is referenced as shown in the following figure. x-axis Origin (0, 0) Coordinate before rotation BG display screen (x1, y1) Horizontal line before rotation Coordinate after rotation ( x2 , y2 ) ∗ BG da ta ref ere nce are a θ Ho riz on t rot al lin ati e a on fte r Rotation center coordinate ( x0 , y0 ) dx θ y-axis θ dmy dy dx (distance moved in directionx, same line) = (1 /α ) cos θ dy (distance moved in direction y, same line ) = - (1 /β ) sin θ dmx (distance moved in direction x, next line) = ( 1 /α ) sin θ dmy (distance moved in direction y, next line) =( 1 /β ) cos θ dmx α: Magnification along x-axis β: Magnification along y-axis BG rotation and scaling are implemented in AGB using the following arithmetic expressions.