常用代码1

 

一,计算 label 宽度

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

 二,判断字符串中是否包含英文字母

- (BOOL)isStringContainNumberWith:(NSString *)str {
    NSRegularExpression *numberRegular = [NSRegularExpression regularExpressionWithPattern:@"[A-Za-z]" options:NSRegularExpressionCaseInsensitive error:nil];
    NSInteger count = [numberRegular numberOfMatchesInString:str options:NSMatchingReportProgress range:NSMakeRange(0, str.length)];
    //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
    if (count > 0) {
        return YES;
    }
    return NO;
}

三,从横屏跳转到竖屏

        if (!([PTVConfig instance].orotatemask == UIInterfaceOrientationMaskPortrait))
        {
            
            [PTVConfig instance].orotatemask = UIInterfaceOrientationMaskPortrait;
            [[PTVConfig instance] setOrientation:UIDeviceOrientationPortrait];
            [UIViewController attemptRotationToDeviceOrientation];
        }
        [GETVIEWCONTROLLERMGR pushLoginController:self.parentVc.navigationController];

 四,带秒表的定时器

- (void)startPkTimer
{
    _percens = 100;
    [self removeCountTimer];
    _timer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(_timerAction) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
}

- (void)_timerAction
{
    _percens -= 5 ;
    if(_percens <= 0){
        _countWownTimer -= 1;
        _percens = 100;
    }
    NSLog(@"lz465350===>%li---%li",(long)_countWownTimer,(long)_percens);
    if (_countWownTimer <= -1 ) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if (self.timerFinished)
            {
                self.timerFinished();
            }
            [self removeCountTimer];
        });
        return;
    } else {
        NSString *text = [self getTimerText:_countWownTimer percens:_percens];
        dispatch_async(dispatch_get_main_queue(), ^{
            self.text = text;
        });
    }
}