一,计算 label 宽度

1 - (CGFloat)getCurExpLabelBgWidth:(NSString *)str 2 { 3     str = ISSTRING(str) ? str : @"0"; 4     UILabel *label = [[UILabel alloc] init]; 5     CGFloat fontSize = 12 * kBigScreenViewWidthRate; 6     label.font = [[PTVConfig instance] normalFont:fontSize]; 7     label.text = str; 8     CGRect rect = [label textRectForBounds:CGRectMake(0, 0, MAXFLOAT, fontSize ) limitedToNumberOfLines:1]; 9     CGFloat length = rect.size.width;10     return length;11 } 

 二,判断字符串中是否包含英文字母

1 - (BOOL)isStringContainNumberWith:(NSString *)str {2     NSRegularExpression *numberRegular = [NSRegularExpression regularExpressionWithPattern:@"[A-Za-z]" options:NSRegularExpressionCaseInsensitive error:nil];3     NSInteger count = [numberRegular numberOfMatchesInString:str options:NSMatchingReportProgress range:NSMakeRange(0, str.length)];4     //count是str中包含[A-Za-z]数字的个数，只要count>0，说明str中包含数字5     if (count > 0) {6         return YES;7     }8     return NO;9 }

三,从横屏跳转到竖屏

1         if (!([PTVConfig instance].orotatemask == UIInterfaceOrientationMaskPortrait))2         {3             4             [PTVConfig instance].orotatemask = UIInterfaceOrientationMaskPortrait;5             [[PTVConfig instance] setOrientation:UIDeviceOrientationPortrait];6             [UIViewController attemptRotationToDeviceOrientation];7         }8         [GETVIEWCONTROLLERMGR pushLoginController:self.parentVc.navigationController];

 四,带秒表的定时器

1 - (void)startPkTimer 2 { 3     _percens = 100; 4     [self removeCountTimer]; 5     _timer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(_timerAction) userInfo:nil repeats:YES]; 6     [[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes]; 7 } 8  9 - (void)_timerAction10 {11     _percens -= 5 ;12     if(_percens <= 0){13         _countWownTimer -= 1;14         _percens = 100;15     }16     NSLog(@"lz465350===>%li---%li",(long)_countWownTimer,(long)_percens);17     if (_countWownTimer <= -1 ) {18         dispatch_async(dispatch_get_main_queue(), ^{19             if (self.timerFinished)20             {21                 self.timerFinished();22             }23             [self removeCountTimer];24         });25         return;26     } else {27         NSString *text = [self getTimerText:_countWownTimer percens:_percens];28         dispatch_async(dispatch_get_main_queue(), ^{29             self.text = text;30         });31     }32 }