ios 如何快速使用 objectAtIndex
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How to use objectAtIndex in swift
提问by SaeHyun Kim
*IDE: XCODE 6 beta3
*Language: Swift + Objective C
*IDE：XCODE 6 beta3
*语言：Swift + Objective C
Here is my code.
这是我的代码。
Objective C Code
目标 C 代码
@implementation arrayTest
{
NSMutableArray *mutableArray;
}
- (id) init {
self = [super init];
if(self) {
mutableArray = [[NSMutableArray alloc] init];
}
return self;
}
- (NSMutableArray *) getArray {
...
return mutableArray; // mutableArray = {2, 5, 10}
}
Swift Code
SWIFT代码
var target = arrayTest.getArray() // target = {2, 5, 10}
for index in 1...10 {
for targetIndex in 1...target.count { // target.count = 3
if index == target.objectAtIndex(targetIndex-1) as Int {
println("GET")
} else {
println(index)
}
}
}
I want the following result:
我想要以下结果：
1 GET 3 4 GET 6 7 8 9 GET
But, my code gives me the error
但是，我的代码给了我错误
libswift_stdlib_core.dylib`swift_dynamicCastObjCClassUnconditional:
0x107e385b0: pushq %rbp
...(skip)
0x107e385e4: leaq 0xa167(%rip), %rax ; "Swift dynamic cast failed"
0x107e385eb: movq %rax, 0x6e9de(%rip) ; gCRAnnotations + 8
0x107e385f2: int3
0x107e385f3: nopw %cs:(%rax,%rax)
.
.
if index == target.objectAtIndex(targetIndex-1) as Int {
// target.objectAtIndex(0) = 2 -> but type is not integer
I think this code is incomplete.
But I can't find the solution.
Help me T T
我认为这段代码不完整。但我找不到解决方案。
帮帮我TT
回答by iOSAppGuy
In Obj-C, objectAtIndex: 2 looks like this:
在 Obj-C 中， objectAtIndex: 2 看起来像这样：
[self.myArray ObjectAtIndex:2]
In Swift objectAtIndex: 2 looks like this:
在 Swift objectAtIndex: 2 中看起来像这样：
self.myArray[2]
回答by Sulthan
I have simulated your array using:
我已经使用以下方法模拟了您的数组：
NSArray * someArray() {
return @[@2, @5, @10];
}
And your code compiles and runs without problems in Xcode 6 Beta 3
并且您的代码在Xcode 6 Beta 3 中编译和运行都没有问题
However, your code doesn't do what you want because it prints 10 * target.countnumbers
但是，您的代码不会执行您想要的操作，因为它会打印10 * target.count数字
Correctly, it should be
正确的应该是
let target = arrayTest.getArray() as [Int]
for index in 1...10 {
var found = false
for targetIndex in indices(target) {
if index == target[targetIndex] {
found = true
break
}
}
if (found) {
println("GET")
} else {
println(index)
}
}
or even better
甚至更好
let target = arrayTest.getArray() as [Int]
for index in 1...10 {
if (contains(target, index)) {
println("GET")
} else {
println(index)
}
}
