iOS在UILabel、UITextFeild等中显示表情的方法,可以使用表情的编码方式来显示。如下
face.text = @"\ue415\ue056";   //其中\ue415,ue056就是表情对应的编码

iOS中表情的编码列表如下:
\ue415 \ue056 \ue057 \ue414 \ue405 \ue106 \ue418
\ue417 \ue40d \ue40a \ue404 \ue105 \ue409 \ue40e
\ue402 \ue108 \ue403 \ue058 \ue407 \ue401 \ue40f
\ue40b \ue406 \ue413 \ue411 \ue412 \ue410 \ue107
\ue059 \ue416 \ue408 \ue40c \ue11a \ue10c \ue32c
\ue32a \ue32d \ue328 \ue32b \ue022 \ue023 \ue327
\ue329 \ue32e \ue32f \ue335 \ue334 \ue021 \ue337
\ue020 \ue336 \ue13c \ue330 \ue331 \ue326 \ue03e
\ue11d \ue05a \ue00e \ue421 \ue420 \ue00d \ue010
\ue011 \ue41e \ue012 \ue422 \ue22e \ue22f \ue231
\ue230 \ue427 \ue41d \ue00f \ue41f \ue14c \ue201
\ue115 \ue428 \ue51f \ue429 \ue424 \ue423 \ue253
\ue426 \ue111 \ue425 \ue31e \ue31f \ue31d \ue001
\ue002 \ue005 \ue004 \ue51a \ue519 \ue518 \ue515
\ue516 \ue517 \ue51b \ue152 \ue04e \ue51c \ue51e
\ue11c \ue536 \ue003 \ue41c \ue41b \ue419 \ue41a
\ue04a \ue04b \ue049 \ue048 \ue04c \ue13d \ue443
\ue43e \ue04f \ue052 \ue053 \ue524 \ue52c \ue52a
\ue531 \ue050 \ue527 \ue051 \ue10b \ue52b \ue52f
\ue528 \ue01a \ue134 \ue530 \ue529 \ue526 \ue52d
\ue521 \ue523 \ue52e \ue055 \ue525 \ue10a \ue109
\ue522 \ue019 \ue054 \ue520 \ue306 \ue030 \ue304
\ue110 \ue032 \ue305 \ue303 \ue118 \ue447 \ue119
\ue307 \ue308 \ue444 \ue441      
\ue436 \ue437 \ue438 \ue43a \ue439 \ue43b \ue117
\ue440 \ue442 \ue446 \ue445 \ue11b \ue448 \ue033
\ue112 \ue325 \ue312 \ue310 \ue126 \ue127 \ue008
\ue03d \ue00c \ue12a \ue00a \ue00b \ue009 \ue316
\ue129 \ue141 \ue142 \ue317 \ue128 \ue14b \ue211
\ue114 \ue145 \ue144 \ue03f \ue313 \ue116 \ue10f
\ue104 \ue103 \ue101 \ue102 \ue13f \ue140 \ue11f
\ue12f \ue031 \ue30e \ue311 \ue113 \ue30f \ue13b
\ue42b \ue42a \ue018 \ue016 \ue015 \ue014 \ue42c
\ue42d \ue017 \ue013 \ue20e \ue20c \ue20f \ue20d
\ue131 \ue12b \ue130 \ue12d \ue324 \ue301 \ue148
\ue502 \ue03c \ue30a \ue042 \ue040 \ue041 \ue12c
\ue007 \ue31a \ue13e \ue31b \ue006 \ue302 \ue319
\ue321 \ue322 \ue314 \ue503 \ue10e \ue318 \ue43c
\ue11e \ue323 \ue31c \ue034 \ue035 \ue045 \ue338
\ue047 \ue30c \ue044 \ue30b \ue043 \ue120 \ue33b
\ue33f \ue341 \ue34c \ue344 \ue342 \ue33d \ue33e
\ue340 \ue34d \ue339 \ue147 \ue343 \ue33c \ue33a
\ue43f \ue34b \ue046 \ue345 \ue346 \ue348 \ue347
\ue34a \ue349          
\ue036 \ue157 \ue038 \ue153 \ue155 \ue14d \ue156
\ue501 \ue158 \ue43d \ue037 \ue504 \ue44a \ue146
\ue50a \ue505 \ue506 \ue122 \ue508 \ue509 \ue03b
\ue04d \ue449 \ue44b \ue51d \ue44c \ue124 \ue121
\ue433 \ue202 \ue135 \ue01c \ue01d \ue10d \ue136
\ue42e \ue01b \ue15a \ue159 \ue432 \ue430 \ue431
\ue42f \ue01e \ue039 \ue435 \ue01f \ue125 \ue03a
\ue14e \ue252 \ue137 \ue209 \ue154 \ue133 \ue150
\ue320 \ue123 \ue132 \ue143 \ue50b \ue514 \ue513
\ue50c \ue50d \ue511 \ue50f \ue512 \ue510 \ue50e
\ue21c \ue21d \ue21e \ue21f \ue220 \ue221 \ue222
\ue223 \ue224 \ue225 \ue210 \ue232 \ue233 \ue235
\ue234 \ue236 \ue237 \ue238 \ue239 \ue23b \ue23a
\ue23d \ue23c \ue24d \ue212 \ue24c \ue213 \ue214
\ue507 \ue203 \ue20b \ue22a \ue22b \ue226 \ue227
\ue22c \ue22d \ue215 \ue216 \ue217 \ue218 \ue228
\ue151 \ue138 \ue139 \ue13a \ue208 \ue14f \ue20a
\ue434 \ue309 \ue315 \ue30d \ue207 \ue229 \ue206
\ue205 \ue204 \ue12e \ue250 \ue251 \ue14a \ue149
\ue23f \ue240 \ue241 \ue242 \ue243 \ue244 \ue245
\ue246 \ue247 \ue248 \ue249 \ue24a \ue24b \ue23e
\ue532 \ue533 \ue534 \ue535 \ue21a \ue219 \ue21b
\ue02f \ue024 \ue025 \ue026 \ue027 \ue028 \ue029
\ue02a \ue02b \ue02c \ue02d \ue02e \ue332 \ue333
\ue24e \ue24f \ue537
 
http://www.easyapns.com/iphone-emoji-alerts