- int num1 = 7;
- int(^aBlock)(int) = ^)int num2) {
- return num1+nunm2;
- };
- NSLog(@"%d", aBlock(49)); //adds 49 to 7 which gives us 56.
- NSComperator compareStringsBlock = ^(id stringA, id stringB) {
- NSRange rangeS = NSMakeRange (0, [stringA length]);
- return (stringA compare:stringB options:comparisonOptions range:rangeS locale:currentLocale];
- };
- NSArray *compareSortArray = [arrayOfStringDays sortArrayUsingComparator: compareStringsBlock]);
- int (^oneFrom)(int) = ^(int anInt) {
- return anInt - 1;
- };
- // 我们创建了一个内联块^(int anInt)... ,其函数体和结果被传到了另外一个名为OneFrom的Block。
- printf("1 from 10 is %d", oneFrom(10));
- // 打印出: "1 from 10 is 9"
- // 这个block函数(distanceTraveled)传入3个float型参数,返回float值。
- float (^distanceTraveled) (float, float, float) =
- ^(float startingSpeed, float acceleration, float time) {
- float distance = (startingSpeed * time) + (0.5 * acceleration * time * time);
- return distance;
- };
- NSArray *anArray = [NSArray arrayWithObjects: @"cat", @"dog",nil];
- sortFunction(anArray, ^(string *a string *b){
- if ( a == @"cat") return TRUE; });
- NSArray *array = [NSArray arrayWithObjects: @"A", @"B", @"C", nil];
- NSSet *filterSet = [NSSet setWithObjects: @"A", @"Z", @"Q", nil];
- BOOL (^test)(id obj, NSUInteger idx, BOOL *stop); //Block declaration returns BOOL, params inc. id and BOOL
- //body of block gets the block literal ^(id obj, NSUInteger idx, Bool *stop)... and the body logic
- test = ^ (id obj, NSUInteger idx, BOOL *stop) {
- if (idx < 5) {
- if ([filterSet containsObject: obj]) {
- return YES;
- }
- }
- return NO;
- };
- __block BOOL found = NO;
- NSSet *aSet = [NSSet setWithObjects: @"Alpha", @"Beta", @"Gamma", @"X", nil];
- NSString *string = @"gamma";
- //we provide below a way of how to enumerate, using our own compare logic
- [aSet enumerateObjectsUsingBlock:^(id obj, BOOL *stop) {
- if ([obj localizedCaseInsensitiveCompare:string] == NSOrderedSame) {
- *stop = YES;
- found = YES;
- }
- }];
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