NSArray 演示（无注释）

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#ios #nsarray

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本文探讨了Objective-C中使用NSLog打印数组信息、数组元素共享特性、数组元素属性修改及其影响、数组元素遍历、数组字符串连接、数组元素比较、数组排序、冒泡排序算法应用、数组元素删除等基本操作。

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#import <Foundation/Foundation.h>

#import "ArrayTest.h"

void arrayTest1()

{

NSArray *array = [[NSArray alloc] initWithObjects:@"1",@"2", @"abc", nil];

NSLog(@"%@, %d, %@", array, (int)array.count,

[array objectAtIndex:0]);

}

void arrayTest2()

{

//数组之间元素是否共享

ArrayTest *x = [[ArrayTest alloc] init];

x.test = 999;

id carray[3] = {@"1", @"2", x};

NSArray *array = [NSArray arrayWithObjects:carray count:3];

NSArray *array2 = [NSArray arrayWithArray:array];

ArrayTest *x0 = [array objectAtIndex:2];

ArrayTest *x1 = [array2 objectAtIndex:2];

x0.test = 100;

NSLog(@"%@(%d), %@(%d)", array, x0.test,

array2, x1.test);

}

void arrayTest3()

{

NSArray *array = [NSArray arrayWithObjects:@"1", @"2",[NSNumber numberWithInt:10], nil];

for (int i=0; i < array.count; i++) {

id obj = [array objectAtIndex:i];

NSLog(@"%@", obj);

}

// for (type in 数组)

for (id a in array) {

NSLog(@"%@", a);

}

void arrayTest4()

{

NSArray *array = [NSArray arrayWithObjects:@"etc",@"dev", @"passwd", nil];

NSString *str = [array componentsJoinedByString:@"/"];

NSLog(@"%@\n%@", [str componentsSeparatedByString:@"/"], str);

}

void arrayTest5()

{

ArrayTest *a = [[ArrayTest alloc] init];

a.test = 100;

ArrayTest *b = [[ArrayTest alloc] init];

b.test = 100;

NSString *str = [NSString stringWithFormat:@"%s", "123"];

NSArray *array = [NSArray arrayWithObjects:a, @"123",@"456", nil];

if ([array containsObject:b])

NSLog(@"%@", array);

if ([array indexOfObject:b] != NSNotFound)

NSLog(@"%@", b);

}

NSInteger compareFunc(id a, id b, void *context)

{

NSString *x = (NSString *)a;

NSString *y = (NSString *)b;

return -[x compare:y options:NSCaseInsensitiveSearch];

}

void arrayTest6()

{

NSArray *strarray = [NSArray arrayWithObjects:@"c",@"a", @"b", nil];

NSArray *res = [strarray sortedArrayUsingFunction:compareFunc context:NULL];

res = [strarray sortedArrayUsingSelector:@selector(compare:)];

NSLog(@"%@\n%@", strarray, res);

}

NSInteger compareArray(id a, id b, void *context)

{

ArrayTest *x = (ArrayTest *)a;

ArrayTest *y = (ArrayTest *)b;

if (x.test > y.test)

return 1;

else if (x.test < y.test)

return -1;

else

return 0;

}

void arrayTest7()

{

ArrayTest *a = [[ArrayTest alloc] init];

ArrayTest *b = [[ArrayTest alloc] init];

ArrayTest *c = [[ArrayTest alloc] init];

a.test = 100;

b.test = 5;

c.test = 20;

NSArray *strarray = [NSArray arrayWithObjects:a,b,c, nil];

NSArray *res = [strarray sortedArrayUsingFunction:compareArray context:NULL];

NSLog(@"%@\n%@", strarray, res);

}

void arrayTest8()

{

ArrayTest *a = [[ArrayTest alloc] init];

ArrayTest *b = [[ArrayTest alloc] init];

ArrayTest *c = [[ArrayTest alloc] init];

a.test = 100;

b.test = 5;

c.test = 20;

NSArray *strarray = [NSArray arrayWithObjects:a,b,c, nil];

NSArray *res = [strarray sortedArrayUsingSelector:

@selector(compareA:)];

NSLog(@"%@\n%@", strarray, res);

}

void bubble(NSMutableArray *array)

{

int cnt = (int)array.count;

int i, j;

ArrayTest *x, *y;

for (i = 1; i < cnt; i++) {

for (j = 0; j < cnt-i; j++) {

x = (ArrayTest *)[array objectAtIndex:j];

y = (ArrayTest *)[array objectAtIndex:j+1];

if ([x compareA:y] == 1)

[array exchangeObjectAtIndex:j withObjectAtIndex:j+1];

}

void arrayTest9()

{

ArrayTest *a = [[ArrayTest alloc] init];

ArrayTest *b = [[ArrayTest alloc] init];

ArrayTest *c = [[ArrayTest alloc] init];

a.test = 100;

b.test = 5;

c.test = 20;

NSMutableArray *strarray = [NSMutableArray arrayWithObjects:a,b,c, nil];

bubble(strarray);

NSLog(@"%@", strarray);

}

void arrayTest10()

{

NSMutableArray *array = [NSMutableArray arrayWithCapacity:10];

[array addObject:@"1"];

[array addObject:@"2"];

[array addObject:@"3"];

// for (NSString * s in array) {

// if ([ s isEqualToString:@"1"]) {

// [array removeObject:s];

// //break;

// }

for (int i = 0; i < array.count; i++) {

NSString *s = [array objectAtIndex:i];

if ([s isEqualToString:@"1"])

[array removeObject:s];

}

SEL x = @selector(方法名) = @selector(initWithCapacity:);

int main(int argc, const char * argv[])

{

@autoreleasepool {

arrayTest2();

}

return 0;

}