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NSString *name;
NSString *name;
- (void)applicationDidEnterBackground:(UIApplication *)application {

typedef NS_ENUM(NSInteger, UIButtonType) {    UIButtonTypeDetailDisclosure,    UIButtonTypeInfoLight,    UIButtonTypeInfoDark,    UIButtonTypeContactAdd,};struct CLLocationCoordinate2D {    CLLocationDegrees latitude;    CLLocationDegrees longitude;};textView.textViewShouldBeginEditing = ^(UITextView *textView){    return YES;};

}
if (1 == 1) {//判断是否为真
//代码
}//判断是否为真
for (i=1; i++; i<=7)
for (i=1; i++; i<=NUM_DAYS_IN_WEEK)
CGRect frame = self.view.frame;
CGFloat x = CGRectGetMinX(frame);
CGFloat y = CGRectGetMinY(frame);
CGFloat width = CGRectGetWidth(frame);
CGFloat height = CGRectGetHeight(frame);
CGRect frame = CGRectMake(0.0, 0.0, width, height);
- (instancetype)init
{
self = [super init];
if (self) {
//代码
}
return self;
}
+ (instancetype)sharedInstance
{
static id instance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance = [[self alloc] init];
});
return instance;
}
//普通常量
static const NSTimeInterval ANIMATION_DURATION = 0.3;

//外部常量
extern const NSTimeInterval TYANIMATION_DURATION;