做登入介面時，使用者在uitextfield中輸入輸入郵箱賬號後，我們應該在本地驗證格式是否正確，再將引數傳給伺服器驗證。
最簡單的就是利用系統的nspredicate
//利用正規表示式驗證
-(bool)isvalidateemail:(nsstring *)email ";
nspredicate *emailtest = [nspredicate predicatewithformat:@"self matches %@", emailregex];
return [emailtest evaluatewithobject:email];
#import "nsstring+check.h"
@implementation nsstring (check)
-(bool)checkphonenuminput$";
nsstring * cm = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d$";
nsstring * cu = @"^1(3[0-2]|5[256]|8[56])\\d$";
nsstring * ct = @"^1((33|53|8[09])[0-9]|349)\\d$";
// nsstring * phs = @"^0(10|2[0-5789]|\\d)\\d$";
nspredicate *regextestmobile = [nspredicate predicatewithformat:@"self matches %@", mobile];
nspredicate *regextestcm = [nspredicate predicatewithformat:@"self matches %@", cm];
nspredicate *regextestcu = [nspredicate predicatewithformat:@"self matches %@", cu];
nspredicate *regextestct = [nspredicate predicatewithformat:@"self matches %@", ct];
bool res1 = [regextestmobile evaluatewithobject:self];
bool res2 = [regextestcm evaluatewithobject:self];
bool res3 = [regextestcu evaluatewithobject:self];
bool res4 = [regextestct evaluatewithobject:self];
if (res1 || res2 || res3 || res4 )
return yes;
else
return no;
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