Here’s the list of available fonts in iOS 7, brought to you by iFonts.
Academy Engraved LET
AcademyEngravedLetPlain
Al Nile
AlNile
AlNile-Bold
American Typewriter
AmericanTypewriter
AmericanTypewriter-Bold
AmericanTypewriter-Condensed
AmericanTypewriter-
AmericanTypewriter-
AmericanTypewriter-Light
Apple Color Emoji
AppleColorEmoji
Apple SD Gothic Neo
AppleSDGothicNeo-Bold
AppleSDGothicNeo-Light
AppleSDGothicNeo-Medium
AppleSDGothicNeo-Regular
AppleSDGothicNeo-SemiBold
AppleSDGothicNeo-Thin
Arial
Arial-BoldItalicMT
Arial-BoldMT
Arial-ItalicMT
ArialMT
Arial Hebrew
ArialHebrew
ArialHebrew-Bold
ArialHebrew-Light
Arial Rounded MT Bold
ArialRoundedMTBold
Avenir
Avenir-Black
Avenir-BlackOblique
Avenir-Book
Avenir-BookOblique
Avenir-Heavy
Avenir-HeavyOblique
Avenir-Light
Avenir-LightOblique
Avenir-Medium
Avenir-MediumOblique
Avenir-Oblique
Avenir-Roman
Avenir Next
AvenirNext-Bold
AvenirNext-BoldItalic
AvenirNext-DemiBold
AvenirNext-DemiBoldItalic
AvenirNext-Heavy
AvenirNext-HeavyItalic
AvenirNext-Italic
AvenirNext-Medium
AvenirNext-MediumItalic
AvenirNext-Regular
AvenirNext-UltraLight
AvenirNext-UltraLightItalic
Avenir Next Condensed
AvenirNextCondensed-Bold
AvenirNextCondensed-BoldItalic
AvenirNextCondensed-DemiBold
AvenirNextCondensed-
AvenirNextCondensed-Heavy
AvenirNextCondensed-
AvenirNextCondensed-Italic
AvenirNextCondensed-Medium
AvenirNextCondensed-
AvenirNextCondensed-Regular
AvenirNextCondensed-UltraLight
AvenirNextCondensed-
Bangla Sangam MN
BanglaSangamMN
BanglaSangamMN-Bold
Baskerville
Baskerville
Baskerville-Bold
Baskerville-BoldItalic
Baskerville-Italic
Baskerville-SemiBold
Baskerville-SemiBoldItalic
Bodoni 72
BodoniSvtyTwoITCTT-Bold
BodoniSvtyTwoITCTT-Book
BodoniSvtyTwoITCTT-BookIta
Bodoni 72 Oldstyle
BodoniSvtyTwoOSITCTT-Bold
BodoniSvtyTwoOSITCTT-Book
BodoniSvtyTwoOSITCTT-BookIt
Bodoni 72 Smallcaps
BodoniSvtyTwoSCITCTT-Book
Bodoni Ornaments
BodoniOrnamentsITCTT
Bradley Hand
BradleyHandITCTT-Bold
Chalkboard SE
ChalkboardSE-Bold
ChalkboardSE-Light
ChalkboardSE-Regular
Chalkduster
Chalkduster
Cochin
Cochin
Cochin-Bold
Cochin-BoldItalic
Cochin-Italic
Copperplate
Copperplate
Copperplate-Bold
Copperplate-Light
Courier
Courier
Courier-Bold
Courier-BoldOblique
Courier-Oblique
Courier New
CourierNewPS-BoldItalicMT
CourierNewPS-BoldMT
CourierNewPS-ItalicMT
CourierNewPSMT
Damascus
Damascus
DamascusBold
DamascusMedium
DamascusSemiBold
Devanagari Sangam MN
DevanagariSangamMN
DevanagariSangamMN-Bold
Didot
Didot
Didot-Bold
Didot-Italic
DIN Alternate
DINAlternate-Bold
DIN Condensed
DINCondensed-Bold
Euphemia UCAS
EuphemiaUCAS
EuphemiaUCAS-Bold
EuphemiaUCAS-Italic
Farah
Farah
Futura
Futura-CondensedExtraBold
Futura-CondensedMedium
Futura-Medium
Futura-MediumItalic
Geeza Pro
GeezaPro
GeezaPro-Bold
GeezaPro-Light
Georgia
Georgia
Georgia-Bold
Georgia-BoldItalic
Georgia-Italic
Gill Sans
GillSans
GillSans-Bold
GillSans-BoldItalic
GillSans-Italic
GillSans-Light
GillSans-LightItalic
Gujarati Sangam MN
GujaratiSangamMN
GujaratiSangamMN-Bold
Gurmukhi MN
GurmukhiMN
GurmukhiMN-Bold
Heiti SC
STHeitiSC-Light
STHeitiSC-Medium
Heiti TC
STHeitiTC-Light
STHeitiTC-Medium
Helvetica
Helvetica
Helvetica-Bold
Helvetica-BoldOblique
Helvetica-Light
Helvetica-LightOblique
Helvetica-Oblique
Helvetica Neue
HelveticaNeue
HelveticaNeue-Bold
HelveticaNeue-BoldItalic
HelveticaNeue-CondensedBlack
HelveticaNeue-CondensedBold
HelveticaNeue-Italic
HelveticaNeue-Light
HelveticaNeue-LightItalic
HelveticaNeue-Medium
HelveticaNeue-MediumItalic
HelveticaNeue-Thin
HelveticaNeue-Thin_Italic
HelveticaNeue-UltraLight
HelveticaNeue-UltraLightItalic
Hiragino Kaku Gothic ProN
HiraKakuProN-W3
HiraKakuProN-W6
Hiragino Mincho ProN
HiraMinProN-W3
HiraMinProN-W6
Hoefler Text
HoeflerText-Black
HoeflerText-BlackItalic
HoeflerText-Italic
HoeflerText-Regular
Iowan Old Style
IowanOldStyle-Bold
IowanOldStyle-BoldItalic
IowanOldStyle-Italic
IowanOldStyle-Roman
Kailasa
Kailasa
Kailasa-Bold
Kannada Sangam MN
KannadaSangamMN
KannadaSangamMN-Bold
Malayalam Sangam MN
MalayalamSangamMN
MalayalamSangamMN-Bold
Marion
Marion-Bold
Marion-Italic
Marion-Regular
Marker Felt
MarkerFelt-Thin
MarkerFelt-Wide
Menlo
Menlo-Bold
Menlo-BoldItalic
Menlo-Italic
Menlo-Regular
Mishafi
DiwanMishafi
Noteworthy
Noteworthy-Bold
Noteworthy-Light
Optima
Optima-Bold
Optima-BoldItalic
Optima-ExtraBlack
Optima-Italic
Optima-Regular
Oriya Sangam MN
OriyaSangamMN
OriyaSangamMN-Bold
Palatino
Palatino-Bold
Palatino-BoldItalic
Palatino-Italic
Palatino-Roman
Papyrus
Papyrus
Papyrus-Condensed
Party LET
PartyLetPlain
Savoye LET
SavoyeLetPlain
Sinhala Sangam MN
SinhalaSangamMN
SinhalaSangamMN-Bold
Snell Roundhand
SnellRoundhand
SnellRoundhand-Black
SnellRoundhand-Bold
Superclarendon
Superclarendon-Black
Superclarendon-BlackItalic
Superclarendon-Bold
Superclarendon-BoldItalic
Superclarendon-Italic
Superclarendon-Light
Superclarendon-LightItalic
Superclarendon-Regular
Symbol
Symbol
Tamil Sangam MN
TamilSangamMN
TamilSangamMN-Bold
Telugu Sangam MN
TeluguSangamMN
TeluguSangamMN-Bold
Thonburi
Thonburi
Thonburi-Bold
Thonburi-Light
Times New Roman
TimesNewRomanPS-BoldItalicMT
TimesNewRomanPS-BoldMT
TimesNewRomanPS-ItalicMT
TimesNewRomanPSMT
Trebuchet MS
Trebuchet-BoldItalic
TrebuchetMS
TrebuchetMS-Bold
TrebuchetMS-Italic
Verdana
Verdana
Verdana-Bold
Verdana-BoldItalic
Verdana-Italic
Zapf Dingbats
ZapfDingbatsITC
Zapfino
Zapfino
And if you want to learn iOS development, grab the free 5-Part Guide to Getting Started with Swift.