Wiley Professional iPhone & iPod touch Programming: Building Applications for Mobile Safari 978-0-470-25155-3 Benutzerhandbuch

Produktcode

978-0-470-25155-3

Chapter 1: The iPhone and iPod touch Development Platform

Table 1-3: Resource Constraints

Resource

Limitation

Downloaded text resource (HTML, CSS,
JavaScript files)

10MB

JPEG images

128MB (all JPEG images over 2MB are
subsampled—decoding the image to
16x fewer pixels)

PNG, GIF, and TIFF images

8MB (in other words,

width*height*4<8MB

)

Animated GIFs

Less than 2MB ensures that frame rate is
maintained (over 2MB, only first frame
is displayed)

Non-streamed media files

10MB

PDF, Word, Excel documents

30MB and up (very slow)

JavaScript stack and object allocation

10MB

JavaScript execution limit

5 seconds for each top-level entry point
(

catch

is called after 5 seconds in a

try/catch

block)

Open pages in Mobile Safari

8 pages

Table 1-4: Technologies not Supported by iPhone and iPod touch

Area

Technologies not supported

Web technologies

Flash media, Java applets, SOAP, XSLT, SVG, and Plug-in
installation

Mobile technologies

WML

File access

Local file system access

Text interaction

Text selection, Cut/Copy/Paste

Embedded video

In-place video (tapping an embedded element will put
iPhone/iPod touch into video playback mode)

Security

Diffie-Hellman protocol, DSA keys, self-signed certificates,
and custom x.509 certificates

JavaScript events

Several mouse-related events (see Chapter 5)

JavaScript commands

showModalDialog()

print()

Bookmark icons

.ico

files

HTML

input type=”file”

, tool tips

CSS

Hover styles,

position:fixed

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