1、關(guān)于NSString的方法
官方提供的方法：
/* In the enumerate methods, the blocks will be invoked inside an autorelease pool, so any values assigned inside the block should be retained.
*/
- (void)enumerateSubstringsInRange:(NSRange)range options:(NSStringEnumerationOptions)opts usingBlock:(void (^)(NSString * __nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);
- (void)enumerateLinesUsingBlock:(void (^)(NSString *line, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);
// ? ?字符串
? ?NSString *filePath = [[NSBundle mainBundle] pathForResource:@"girl" ofType:@"txt"];
? ?NSData *fileData = [NSData dataWithContentsOfFile:filePath];
? ?NSString *fileStr = [[NSString alloc]initWithData:fileData encoding:NSUTF8StringEncoding];
? ?//一行一行的讀取
? ?[fileStr enumerateLinesUsingBlock:^(NSString * _Nonnull line, BOOL * _Nonnull stop) {
? ? ? ?NSLog(@"%@\n",line);
? ?}];
// ? ?一個(gè)字符一字符的讀取
? ?[fileStr enumerateSubstringsInRange:NSMakeRange(0, fileStr.length) options:NSStringEnumerationByWords usingBlock:^(NSString * _Nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL * _Nonnull stop) {
? ? ? ?NSLog(@"tmp111===%@",substring);
? ?}];
2、關(guān)于NSArray的方法的使用
官方提供的方法：
- (void)enumerateObjectsUsingBlock:(void (^)(ObjectType obj, NSUInteger idx, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);
- (void)enumerateObjectsWithOptions:(NSEnumerationOptions)opts usingBlock:(void (^)(ObjectType obj, NSUInteger idx, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);
- (void)enumerateObjectsAtIndexes:(NSIndexSet *)s options:(NSEnumerationOptions)opts usingBlock:(void (^)(ObjectType obj, NSUInteger idx, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);
NSArray *tmpAry = @[@"1",@"2",@"3"];
? ?/**
? ? NSEnumerationConcurrent 當(dāng)前的排序狀態(tài)
? ? NSEnumerationReverse ? ?倒序排列
? ? */
? ?[tmpAry enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(id ?_Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
? ? ? ?NSLog(@"tmpAry===%@\n",obj);
? ?}];
3、關(guān)于NSDictionary的方法的使用
官方方法：
- (void)enumerateKeysAndObjectsUsingBlock:(void (^)(KeyType key, ObjectType obj, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);
- (void)enumerateKeysAndObjectsWithOptions:(NSEnumerationOptions)opts usingBlock:(void (^)(KeyType key, ObjectType obj, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);
// ? ?字典
? ?NSDictionary *tmpdic = @{@"1":@"q",@"2":@"w"};
? ?[tmpdic enumerateKeysAndObjectsUsingBlock:^(id ?_Nonnull key, id ?_Nonnull obj, BOOL * _Nonnull stop) {
? ? ? ?NSLog(@"tmpdis:key=%@ value=%@\n",key,obj);
? ?}];
? ?/**
? ? NSEnumerationConcurrent 當(dāng)前的排序狀態(tài)
? ? NSEnumerationReverse ? ?倒序排列
? ? */
? ?[tmpdic enumerateKeysAndObjectsWithOptions:NSEnumerationReverse usingBlock:^(id ?_Nonnull key, id ?_Nonnull obj, BOOL * _Nonnull stop) {
? ? ? ?NSLog(@"tmpdis2:key=%@ value=%@\n",key,obj);
? ?}];
