Lập trình iPhone part 18

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'LETXIV
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;LIVIXS2I\X#
IPP[S[=SYvVIWXMPP[MXLYWLYL#+VIEX-XWYVILEWFIIREPSRKNSYVRI]WMRGI
XLEXZIV]JMVWXM4LSRIETTPMGEXMSR[IFYMPXXSKIXLIV=SYvZIGIVXEMRP]GSQI
EPSRK[E];IvHPSZIXSXIPP]SYXLEX]SYRS[ORS[MXEPPFYX[LIRMXGSQIW
XSXIGLRSPSK]ERHIWTIGMEPP][LIRMXGSQIWXSTVSKVEQQMRK]SYRIZIV
ORS[MXEPP8LITVSKVEQQMRKPERKYEKIERHJVEQI[SVOW[IvZIFIIR[SVOMRK
[MXLJSVXLIPEWXGLETXIVWEVIXLIIRHVIWYPXSJSZIV]IEVWSJIZSPYXMSR
%RH%TTPIIRKMRIIVWEVIJIZIVMWLP][SVOMRKVSYRHXLIGPSGOXLMROMRKSJXLEX
RI\XGSSPRI[XLMRK8LIM4LSRITPEXJSVQLEWNYWXFIKYRXSFPSWWSQ8LIVIMW
WSQYGLQSVIXSGSQI
&]QEOMRKMXXLVSYKLXLMWFSSO]SYvZIFYMPX]SYVWIPJEWXYVH]JSYRHEXMSR
=SYvZIKSXEWSPMHORS[PIHKISJ3FNIGXMZI''SGSE8SYGLERHXLIXSSPWXLEX
FVMRKXLIWIXIGLRSPSKMIWXSKIXLIVXSGVIEXIMRGVIHMFPIRI[M4LSRIETTPMGE
XMSRW=SYYRHIVWXERHXLIM4LSRIWSJX[EVIEVGLMXIGXYVIXLIHIWMKRTEXXIVRW
XLEXQEOI'SGSE8SYGLWMRK-RWLSVX]SYEVIVIEH]XSGLEVX]SYVS[RGSYVWI
;IEVIWSTVSYH7S[LIVIXSRI\X#
+IXXMRK9RWXYGO
%XMXWGSVITVSKVEQQMRKMWEFSYXTVSFPIQWSPZMRKEFSYXJMKYVMRKXLMRKWSYX
-XvWJYRERHMXvWVI[EVHMRKPMOIJI[XLMRKWEVI&YXEXXMQIW]SY[MPPVYRYT
EKEMRWXETY^^PIXLEXNYWXWIIQWMRWYVQSYRXEFPIETVSFPIQXLEXNYWXHSIWRSX
WIIQXSLEZIEWSPYXMSR
7SQIXMQIWXLIERW[IVNYWXETTIEVWMJ]SYXEOIEFMXSJXMQIE[E]JVSQXLI
TVSFPIQ%KSSHRMKLXvWWPIITSVEJI[LSYVWSJHSMRKWSQIXLMRKHMJJIVIRXGER
SJXIRFIEPPXLEXMWRIIHIHXSKIX]SYXLVSYKLMX&IPMIZIYW]SYGERWXEVIEX
XLIWEQITVSFPIQJSVLSYVWSZIVEREP]^MRKERHKIXXMRK]SYVWIPJWS[SVOIHYT
XLEX]SYQMWWERSFZMSYWWSPYXMSR
',%48)6 ;LIVIXS2I\X#

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%RHXLIRXLIVIEVIXMQIW[LIRIZIREGLERKISJWGIRIV]HSIWRvXLIPT%RHMRXLSWIWMXYE
XMSRWMXvWKSSHXSLEZIJVMIRHWMRLMKLTPEGIW8LIJSPPS[MRKWIGXMSRWSYXPMRIWSQIVIWSYVGIW
]SYGERXYVRXS[LIR]SYvVIMREFMRH
%TTPIvW(SGYQIRXEXMSR
&IGSQISRI[MXL<GSHIvWHSGYQIRXEXMSRFVS[WIV8LIHSGYQIRXEXMSRFVS[WIVMWEJVSRX
IRHXSE[IEPXLSJMRGVIHMFP]ZEPYEFPIWEQTPIWSYVGIGSHIGSRGITXKYMHIW%4-VIJIVIRGIW
ZMHISXYXSVMEPWERHE[LSPIPSXQSVI8LIVIEVIJI[EVIEWSJXLIM4LSRIXLEX]SY[SRvXFI
EFPIXSPIEVRQSVIEFSYXF]QEOMRK]SYV[E]XLVSYKL%TTPIvWHSGYQIRXEXMSR%RHMJ]SY
KIXGSQJSVXEFPI[MXL%TTPIvWHSGYQIRXEXMSRQEOMRK]SYV[E]XLVSYKLYRGLEVXIHXIVVMXS
VMIWERHRI[XIGLRSPSKMIWEW%TTPIVSPPWXLIQSYX[MPPFIIEWMIV
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<GSHIvWHSGYQIRXEXMSRFVS[WIVXEOIW]SYXSXLIWEQIMRJSVQEXMSR]SYGERKIXXSF]KSMRKXS%TTPIvW
(IZIPSTIV'SRRIGXMSR[IFWMXIEX
LXXTHIZIPSTIVETTPIGSQ
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1EMPMRK0MWXW
=SYQMKLXEPWS[ERXXSWMKRYTJSVXLIWILERH]QEMPMRKPMWXW
LXXTPMWXWETTPIGSQQEMPQERPMWXMRJSGSGSEHIZ
8LMWQSHIVEXIP]
LMKLZSPYQIPMWXVYRF]%TTPIMWTVMQEVMP]EFSYX'SGSEJSV1EG37<&IGEYWISJXLI
GSQQSRLIVMXEKIWLEVIHF]'SGSEERH'SGSE8SYGLLS[IZIVQER]SJXLITISTPISR
XLMWPMWXQE]FIEFPIXSLIPT]SY1EOIWYVIXSWIEVGLXLIPMWXEVGLMZIWFIJSVIEWOMRK]SYV
UYIWXMSRXLSYKL
LXXTPMWXWETTPIGSQQEMPQERPMWXMRJS\GSHIYWIVW
%RSXLIVPMWXQEMRXEMRIH
F]%TTPIXLMWSRIMWWTIGMJMGXSUYIWXMSRWERHTVSFPIQWVIPEXIHXS<GSHI
LXXTPMWXWETTPIGSQQEMPQERPMWXMRJSUYEVX^HIZ
8LMWMWER%TTPIQEMRXEMRIH
QEMPMRKPMWXJSVHMWGYWWMSRSJXLI5YEVX^(ERH'SVI+VETLMGWXIGLRSPSKMIW

(MWGYWWMSR*SVYQW
8LIWIHMWGYWWMSRJSVYQWEPPS[]SYXSTSWX]SYVUYIWXMSRWXSE[MHIVERKISJJSVYQVIEHIVW
LXXT[[[MTLSRIHIZWHOGSQ
3RXLMW[IFJSVYQM4LSRITVSKVEQQIVWFSXLRI[
ERHI\TIVMIRGIHLIPTIEGLSXLIVSYX[MXLTVSFPIQWERHEHZMGI
LXXTHMWGYWWMSRWETTPIGSQGEXIKSV]NWTE#GEXIKSV]-(!
8LMWPMROGSR
RIGXW]SYXS%TTPIvWGSQQYRMX]JSVYQWJSV1EGERHM4LSRIWSJX[EVIHIZIPSTIVW
',%48)6 ;LIVIXS2I\X#
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LXXTHMWGYWWMSRWETTPIGSQGEXIKSV]NWTE#GEXIKSV]-(!
8LMWSRIGSR
RIGXWXS%TTPIvWGSQQYRMX]JSVYQWJSVHMWGYWWMRKXLIM4LSRI
;IF7MXIW
:MWMXXLIWI[IFWMXIWJSVLIPTJYPGSHMRKEHZMGI
LXXT[[[MTLSRIHIZFSSOGSQ
8LMWMWXLISJJMGMEP[IFWMXIJSVXLMWFSSO;I[MPPTSWX
IVVEXEEWTISTPIVITSVXFYKWERHX]TSWXSYWERHQEMRXEMRXLIQSWXGYVVIRXZIVWMSRSJ
EPPFSSOTVSNIGXW;IvPPEPWSXIPP]SY[LEX[IvZIFIIR[SVOMRKSRPEXIP]ERH[LEX[IvZI
KSXMRXLI[SVOW
LXXT[[[GSGSEHIZGIRXVEPGSQ
8LMWTSVXEPGSRXEMRWPMROWXSEKVIEXQER]
'SGSEVIPEXIH[IFWMXIWERHXYXSVMEPW
LXXTGSGSELIEHWSVK
'SGSE,IEHWMWEKVSYTHIHMGEXIHXSTIIVWYTTSVXERH
TVSQSXMSRSJ'SGSE-XJSGYWIWSRPSGEPKVSYTW[MXLVIKYPEVQIIXMRKW[LIVI'SGSE
HIZIPSTIVWGERKIXXSKIXLIVLIPTIEGLSXLIVSYXERHIZIRWSGMEPM^IEPMXXPIFMX8LIVIvW
RSXLMRKFIXXIVXLERORS[MRKEVIEPTIVWSR[LSGERLIPT]SYSYXWSMJXLIVIvWE'SGSE
,IEHWKVSYTMR]SYVEVIEGLIGOMXSYX-JXLIVIvWRSX[L]RSXWXEVXSRI#
LXXTRWGSHIVRMKLXGSQ

27'SHIV2MKLXWEVI[IIOP]SVKERM^IHQIIXMRKW[LIVI
'SGSETVSKVEQQIVWKIXXSKIXLIVXSGSHIERHWSGMEPM^I0MOI'SGSE,IEHWQIIXMRKW
27'SHIV2MKLXWEVIMRHITIRHIRXP]SVKERM^IHPSGEPIZIRXW
LXXTGSGSEFPSKWGSQ
8LMWTSVXEPGSRXEMRWPMROWXSEKVIEXQER]FPSKWVIPEXIHXS
'SGSETVSKVEQQMRK
LXXT[[[MTLSRIHIZGIRXVEPSVK
8LMW[IFWMXIMWHIZSXIHXSM4LSRITVSKVEQQMRK
XYXSVMEPW
&PSKW
-J]SYWXMPPLEZIRvXJSYRHEWSPYXMSRXS]SYVGSHMRKHMPIQQE]SYQMKLX[ERXXSVIEHXLIWI
FPSKW
LXXTXLISGEGESGSQ
8LMWFPSKMWQEMRXEMRIHF]7GSXX7XIZIRWSRERI\TIVMIRGIH
'SGSETVSKVEQQIV
LXXT[[[[MPWLMTPI]GSQFPSK
;MP7LMTPI]MWSRISJXLIQSWXI\TIVMIRGIH
3FNIGXMZI'TVSKVEQQIVWSRXLITPERIX,MW4MQT1]'SHIWIVMIWSJFPSKTSWXMRKW
WLSYPHFIVIUYMVIHVIEHMRKJSVER]3FNIGXMZI'TVSKVEQQIV
LXXTVIRX^WGLGSQ
;SPJ6IRX^WGLMWERI\TIVMIRGIHMRHITIRHIRX'SGSETVSKVEQ
QIVERHXLIJSYRHIVSJXLI'MRHITIRHIRXHIZIPSTIVWvGSRJIVIRGI
',%48)6 ;LIVIXS2I\X#

LXXTGLERWSRPMZINSYVREPGSQ
'LVMW,ERWSR[SVOWEX%TTPISRXLI<GSHIXIEQ
ERHLMWFPSKMWJMPPIH[MXLKVIEXMRWMKLXERHMRJSVQEXMSREFSYX<GSHIERHVIPEXIHXSTMGW
%RH-J%PP)PWI*EMPW
(VST(EZIERH.IJJERIQEMPEX
HEZIERHNIJJ$MTLSRIHIZFSSOGSQ

8LMWMWXLITIVJIGXTPEGI
XSWIRHIQEMPWEFSYXX]TSWMRXLIFSSOSVFYKWMRSYVGSHI;IGERvXTVSQMWIXSVIWTSRHXS
IZIV]IQEMPFYX[I[MPPVIEHEPPSJXLIQ&IWYVIXSVIEHXLIIVVEXEFIJSVIGPMGOMRKWIRH%RH
TPIEWIHS[VMXIERHXIPPYWEFSYXXLIGSSPETTPMGEXMSRW]SYHIZIPST
*EVI[IPP
;IWYVIEVIKPEH]SYGEQIEPSRKSRXLMWNSYVRI][MXLYW;I[MWL]SYXLIFIWXSJPYGOERH
LSTIXLEX]SYIRNS]TVSKVEQQMRKXLIM4LSRIEWQYGLEW[IHS

7TIGMEP'LEVEGXIVW
MQTSVXWXEXIQIRXW
TVEKQEHMVIGXMZIWz
GLEVEGXIV
@GLEVEGXIV
IPPMTWMW
%
EFWXVEGXGPEWW
EGGIPIVSQIXIV
EGGIWWMRKz
SZIVZMI[
TL]WMGWSJz
6SPPMRK1EVFPITVSKVEQz
7LEOI%RH&VIEOTVSNIGXz
EGGIPIVSQIXIVHMH%GGIPIVEXIQIXLSHz

EGGIWWSVW
EGGIWWSV]MGSRW
EGGIWWSV]ZMI[
EGGIWWSV]:MI[TVSTIVX]
EGXMSREVKYQIRX
EGXMSRQIXLSH

EGXMSRWLIIXz
EGXMSRW
EHHMRKXSZMI[GSRXVSPPIVWzz
zz
GSRRIGXMRK
HIGPEVMRKzzz
HIXIVQMRMRKz
SZIVZMI[z
WTIGMJ]MRKz
EGXMSR7LIIXHMH(MWQMWW;MXL&YXXSR-RHI\
QIXLSHz
EGXMZIGSRXVSPWz
%HH0SGEPM^EXMSRFYXXSRz
%HHWYFQIRY
%HHXS4VSNIGXWIXXMRK
EHHMXMZITVMQEV]GSPSVW
EHH3FWIVZIVWIPIGXSVREQISFNIGXQIXLSH
%HNYWXXS*MXGLIGOFS\
EPIVXWz
%PMKR,SVM^SRXEP'IRXIVMR'SRXEMRIVSTXMSR
%PMKRQIRXWYFQIRY
EPP2EQIWQIXLSHz
%PTLEGLIGOFS\
EPTLEGSQTSRIRX
EPXMXYHITVSTIVX]
ERMQEXIHTEVEQIXIVz
ERMQEXMSRFPSGO
%TT/MXJVEQI[SVO
%TTPI,YQER-RXIVJEGI+YMHIPMRIW
ETTPMGEXMSRGSRWXERXWz

ETTPMGEXMSRPSGEPM^EXMSRz
ETTPMGEXMSRWIXXMRKW
%TT7IXXMRKWETTPMGEXMSRz
SZIVZMI[
VIEHMRKz
WIXXMRKWFYRHPIW
EHHMRKXSTVSNIGXz
GLMPHWIXXMRKWZMI[z
QYPXMZEPYIJMIPHz
SZIVZMI[
TVSTIVX]PMWXWIXXMRKYTz
WIGYVIXI\XJMIPHWIXXMRK
WPMHIVWIXXMRKz
XI\XJMIPHWIXXMRKz
XSKKPIW[MXGLWIXXMRKz
YWIVHIJEYPXWGLERKMRKz
%TTPMGEXMSR7YTTSVXJSPHIV
ETTPMGEXMSR(MH*MRMWL0EYRGLMRKQIXLSH
ETTPMGEXMSR;MPP8IVQMREXIQIXLSH

%TT7IXXMRKWETTPMGEXMSRz
EVGLMZMRK
HEXESFNIGXWz
QSHIPSFNIGXWz
%VGLMZMRKETTPMGEXMSRz
EXSQMGEPP]TEVEQIXIV
%YHMS8SSPFS\JVEQI[SVO
%YHMS7IVZMGIW'VIEXI7]WXIQ7SYRH-(JYRGXMSR

%YXSGSVVIGXMSR8]TIOI]

EYXSVIPIEWIQIXLSHzz

EYXSVSXEXMSR
EYXSWM^IEXXVMFYXIWz
SZIVZMI[z
VIWXVYGXYVMRKZMI[[LIRVSXEXIHz
-RHI\