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NSString *theString; // You have a string.



/// Option 1: floatValue
if ([theString floatValue] != 0 || [theString hasPrefix:@"0.0"] || [theString isEqualToString:@"0"]) {
    // theString should be number
}

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@implementation UIColor (Random)


+ (instancetype)randomColor {
    return [self colorWithRed:(arc4random() % 255) / 255.f
                        green:(arc4random() % 255) / 255.f
                         blue:(arc4random() % 255) / 255.f
                        alpha:1];
}

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// UIView category

- (void)adjustFrame:(void(^)(CGRect *frame))block {
    CGRect frame = self.frame;
    block(&frame);
    self.frame = frame;
}

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iPhone 5: -568h > ~iphone > @2x > .

-568h@2x~iphone
-568h~iphone
-568h@2x
-568h
@2x~iphone
~iphone
@2x

.

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// How do you implement lazy loading getters?

- (NSString *)title {
    if ( ! self->_title) {
        NSString *string = @"lazy loaded";
        // Do some real stuff here...
        self->_title = string;
    }
    return self->_title;
}

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2013-03-22 21:26:36.231 TeeVee[86457:c07] *** -[__NSCFCalendar components:fromDate:]: date cannot be nil
I mean really, what do you think that operation is supposed to mean with a nil date?
An exception has been avoided for now.
A few of these errors are going to be reported with this complaint, then further violations will simply silently do whatever random thing results from the nil.
Here is the backtrace where this occurred this time (some frames may be missing due to compiler optimizations):
(
    0   CoreFoundation                      0x0283da75 -[__NSCFCalendar components:fromDate:] + 85
	1   TeeVee                              0x00037e0e -[TVUpcomingEpisodeViewController viewDidLoad] + 3886
...

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- (NSString *)stringByDeletingHTML {
    // Delete HTMl tags.
    /// http://stackoverflow.com/questions/277055/remove-html-tags-from-an-nsstring-on-the-iphone
    NSRange range;
    NSMutableString *string = [self mutableCopy];
    while ((range = [string rangeOfString:@"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound)
        [string deleteCharactersInRange:range];
    
    // Replace escaped sequences.
    NSDictionary *escapes = @{

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CGFloat CGFloatAdjustToScreenScale(CGFloat value, NSRoundingMode mode) {
    CGFloat (*roundingFunction)(CGFloat);
    switch (mode) {
        case NSRoundPlain:  roundingFunction = &roundf; break;
        case NSRoundUp:     roundingFunction = &ceilf; break;
        case NSRoundDown:   roundingFunction = &floorf; break;
        case NSRoundBankers:roundingFunction = &roundf; break;
    }
    CGFloat scale = [[UIScreen mainScreen] scale];
    CGFloat result = roundingFunction(value * scale) / scale;

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#if !defined(NS_BLOCK_ASSERTIONS)

#define MTKAssert(CONDITION, MESSAGE, ...)\
if ( ! (CONDITION) && (( [[NSAssertionHandler currentHandler] handleFailureInFunction:[NSString stringWithUTF8String:__PRETTY_FUNCTION__] file:[NSString stringWithUTF8String:__FILE__] lineNumber:__LINE__ description:MESSAGE, ##__VA_ARGS__], YES)) )

#else

#define MTKAssert(CONDITION, MESSAGE, ...)\
if ( ! (CONDITION) && (( NSLog(@"*** Assertion failure in %s, %s:%d, Condition not satisfied: %s, reason: '" MESSAGE "'", __PRETTY_FUNCTION__, __FILE__, __LINE__, #CONDITION, ##__VA_ARGS__), YES)) )

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// The Unlicense (https://unlicense.org)

- (NSString *)guessName {
    unsigned char redComponent = roundf(self.redComponent*4);
    unsigned char greenComponent = roundf(self.greenComponent*4);
    unsigned char blueComponent = roundf(self.blueComponent*4);
    // Component methods implemented below.
    
    static NSString * const black = @"black";
    static NSString * const red = @"red";