int maxvalue(int a,int b)
int main(int argc, const char * argv) ;
block();//--->暴風雨來了
//block自己不會執行,必須呼叫才會執行block大括號裡面的**段
//2.有引數無返回值
void (^maxblock)(int,int) = ^(int a,int b);
maxblock(6,9);//--->9
//void (^)(int,int)是block的型別,他的名字是block,我們也可以通過名進行呼叫
void (^arrblock)(nsarray *) = ^(nsarray *arr)
};nsarray *arr = @[@"1",@"2",@"3"];
arrblock(arr);//--->1,2,3
//3.無引數有返回值
int (^oneblock)() = ^;
nslog(@"%d",oneblock());//block呼叫沒有引數也得有()--->10
//4.有引數有返回值
int (^mblock)(int,int) = ^(int a,int b);
nslog(@"%d",mblock(3,8));//--->8
nsstring *(^ablcok)(nsarray *,nsinteger) = ^(nsarray *arr,nsinteger index);
nslog(@"%@",ablcok(@[@"1",@"2"],1));//--->2
//5.如果想改變block**塊之外的變數值,就必須在之前加入__block關鍵字
__block int x = 100;
int (^sumblock)(int a,int b) = ^int(int a,int b);
//block自己不會執行,必須呼叫才會執行block大括號裡面的**段
nslog(@"x = %d",x);//100
nslog(@"a+b=%d",sumblock(11,14));//25
nslog(@"x = %d",x);//25
//當在開發中乙個方法有多種實現的時候,如果不確定用哪種方法更好,我們可以考慮把方法中的乙個引數定義成block方式
calculate *cal = [[calculate alloc]init];
int sum = [cal calculatewithnumber1:10 andnumber2:20 andcalculate:sumblock];
nslog(@"a + b = %d",sum);//30
//通過用系統的block對陣列進行遍歷(用法用回車)
nsarray *array = [nsarray arraywithobjects:@"1",@"2",@"3",@"4", nil];
[array enumerateobjectsusingblock:^(id obj, nsuinteger idx, bool *stop) ];
//陣列排序陣列對字串的排序
//不可變陣列
nsarray *arr1 = @[@"zhan",@"wuhe",@"liusansan",@"wangjumin",@"hehehd"];
//sel叫方法選擇器,他是方法選擇器的型別
nsarray *arra = [arr1 sortedarrayusingselector:@selector(compare:)];
nslog(@"%@",arra);//--->hehehd,liusansan,wangjumin,wuhe,zhan
//可變陣列排序
nsmutablearray *array1 = [nsmutablearray arraywithobjects:@"zhan",@"wuhe",@"liusansan",@"wangjumin",@"hehehd",nil];
[array1 sortusingselector:@selector(compare:)];
nslog(@"---%@",array1);//--->hehehd,liusansan,wangjumin,wuhe,zhan
//對物件進行排序
//新建四個人的物件
person *per1 = [person basewithname:@"zhangxiaoyun" ***:@"nv"];
person *per2 = [person basewithname:@"wangya" ***:@"nv"];
person *per3 = [person basewithname:@"liushuxi" ***:@"nan"];
person *per4 = [person basewithname:@"shiyu" ***:@"nv"];
nsarray *arr2 = @[per1,per2,per3,per4];
nsarray *newarr = [arr2 sortedarrayusingcomparator:^nscomparisonresult(person *obj1, person *obj2) ];
for (person *per in newarr)
nsmutablearray *arr3 = [nsmutablearray arraywithobjects:per1,per2,per3,per4,nil];
[arr3 sortusingcomparator:^nscomparisonresult(id obj1, id obj2) ];
for (person *per in arr3)
//---------------------------//sel資料型別------------------------------------
calculate *person = [[calculate alloc]init];
//[person eat];//訊息機制
//使用@select就能夠把乙個方法包裝成sel資料型別
sel s1 = @selector(eat);
[person performselector:s1];
//上面兩句合併等價於下面一句
[person performselector:@selector(eat)];
sel s2 = @selector(call:);
[person performselector:@selector(call:) withobject:@"15382006306"];
sel s3 = @selector(fingname);
nsstring *str = [person performselector:s3];
nslog(@"%@",str);
}
return 0;
#import
typedef
int (^calculateblock)(int a,int b);
@inte***ce
calculate : nsobject
- (int)calculatewithnumber1:(int)number1 andnumber2:(int)number andcalculate:(calculateblock)calculate;
- (void)eat;
- (void)call:(nsstring *)number;
-(nsstring *)fingname;
//簡單的多型-------------------------------------------->
@property(nonatomic,copy)nsstring *name;
@property(nonatomic,copy)nsstring ****;
- (id)initwithname:(nsstring *)name ***:(nsstring *)***;
+ (id)basewithname:(nsstring *)name ***:(nsstring *)***;
@end
#import "calculate.h"
@implementation
calculate
- (int)calculatewithnumber1:(int)number1 andnumber2:(int)number2 andcalculate:(calculateblock)calculate
- (void)eat
- (void)call:(nsstring *)number
-(nsstring *)fingname
//簡單的多型-------------------------------------------->
- (id)initwithname:(nsstring *)name ***:(nsstring *)***
return
self;
}+ (id)basewithname:(nsstring *)name ***:(nsstring *)***
@end
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