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大部分的时候NSString的属性都是copy,那copy与strong的情况下到底有什么区别呢? 比如: @property (retain,nonatomic) NSString *rStr; @property (copy, nonatomic) NSString *cStr; - (void)test: { NSMutableString *mStr = [NSMutableStrin...

NSString *String = [NSString StringWithFormat:@"%@",number]; 或者 NSString *String = number.description;

NSURL *url ... NSString *urlStr = url.absoluteString;

- (BOOL)hasPrefix:(NSString *)aString; 字符xString串前面是否包含aString BOOL isHavePrefix = [xString hasPrefix:aString]; 包含返回YES,不包含返回NO。

代码如下: NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateStyle:NSDateFormatterMediumStyle]; [dateFormatter setTimeStyle:NSDateFormatterNoStyle]; [dateFormatter setTimeZone:GTMzone]; NSDa...

- (void)viewDidLoad { [super viewDidLoad]; NSDictionary *dict = @{@"aaa":@"11",@"bb":@"22",@"cc":@"33"}; NSString *str = [self dictionaryToJson:dict]; NSDictionary *dict1 = [self dictionaryWithJsonString:str]; NSLog(@"%@",str);...

iOS 7 containsstring的实现方法如下: - (BOOL)containsString:(NSString *)aString NS_AVAILABLE(10_10, 8_0){ if (IS_BLANK_STRING(aString)) { return NO; } if ([self rangeOfString:aString].location != NSNotFound) { return YES; } ret...

假设要查询的字符串味: NSString *searchStr = @"a string with substr"; 查询(是否)被包含的字符串为@"substr",则通过下面的判断: if ([searchStr rangeOfString:@"substr"].location != NSNotFound) { //条件为真,表示字符串searchStr包...

NSString *string = @"qwer"; NSMutableString *newString = [[NSMutableString alloc] initWithCapacity:string.length]; for (int i = string.length - 1; i >=0 ; i --) { unichar ch = [string characterAtIndex:i]; [newString appendForma...

iOS containsstring方法的实现的具体步骤如下: -(void) filterFriendsArray:(NSString*)filter { [_filteredFriendsArray removeAllObjects]; for (FacebookUser* user in _friendsArray) { NSString* nameLower = [user.user.name lowercaseSt...

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